Меня тоже успокаивает её спокойный голос, а подруга ещё и умеет ободрить в трудный момент.

Because меня is the accusative case of я (I).

In this sentence, меня is the person being affected by успокаивает. The verb успокаивать / успокоить takes a direct object:

• голос успокаивает меня = the voice calms me

So:

• я = I (subject form, nominative)
• меня = me (object form, accusative/genitive)

Here, голос is the subject, and меня is the object.

Because the subject of успокаивает is only голос:

• её спокойный голос успокаивает меня

So the verb agrees with голос, which is:

• masculine
• singular
• nominative

That is why the verb is успокаивает = (it/he) calms, not a plural form.

The other person, подруга, belongs to the second clause after а.

Here её means her in the possessive sense:

• её спокойный голос = her calm voice

Important point: её can mean different things in Russian depending on context:

• Я вижу её. = I see her.
• Это её голос. = This is her voice.

In your sentence, it modifies the noun голос, so it is clearly possessive.

Also, Russian possessive её does not change form for case, gender, or number:

• её голос
• её подруга
• её книги

Because спокойный must agree with голос.

Голос is:

• masculine
• singular
• nominative

So the adjective also has to be:

• masculine
• singular
• nominative

That gives:

• спокойный голос

Compare:

• спокойная музыка (feminine)
• спокойное море (neuter)
• спокойные люди (plural)

Тоже means also / too.

In this sentence, it adds the idea that I, too, am calmed. The placement helps show what is being emphasized.

• Меня тоже успокаивает... = It calms me too...

Russian word order is flexible, so тоже often comes near the word it relates to. Here it is closely tied to меня.

Compare the feel of these:

• Меня тоже успокаивает её голос. = Her voice calms me too.
• Её голос тоже успокаивает меня. = Her voice also calms me.

Both are possible, but they emphasize slightly different things.

А is a conjunction. It often means and, while, or but, depending on context.

Here it connects two related ideas and also sets up a mild contrast between them:

• её спокойный голос does one comforting thing
• подруга does something more active

So а here is something like:

• and
• while
• whereas

It is not a strong contradiction like English but, but it does mark a shift from one idea to another.

Ещё и adds emphasis. It means something like:

• and also
• what’s more
• on top of that
• even

So:

• подруга ещё и умеет ободрить...

suggests that the friend not only has some implied good quality, but also has the ability to encourage at the right moment.

This combination is very common in Russian for adding an extra point with emphasis.

Compare:

• Он поёт. = He sings.
• Он ещё и танцует. = He even dances too / He also dances on top of that.

Уметь + infinitive means to know how to do something or to be able to do something well.

So:

• умеет ободрить = knows how to encourage / is good at encouraging

This is a very common Russian pattern:

• умеет готовить = knows how to cook
• умеет слушать = knows how to listen
• умеет поддержать = knows how to support

Here it does not just mean physical ability. It often suggests a kind of practical skill or personal talent.

This is an aspect question.

• ободрить = perfective
• ободрять = imperfective

With уметь, both aspects can appear, but they give different shades of meaning.

Here ободрить sounds natural because it suggests being able to encourage successfully in a particular moment. It focuses on the result of the action.

• умеет ободрить в трудный момент = she knows how to say or do the right thing when it matters

If you used ободрять, it would sound more like a general ongoing activity or habitual process of encouraging, which is less natural in this exact phrase.

Because after в, Russian can use either:

• accusative for movement into something, or for many time expressions
• prepositional for location

Here в трудный момент is a time expression meaning:

• at a difficult moment
• in a difficult moment

In this kind of expression, Russian uses the accusative:

• в тот момент
• в трудную минуту
• в следующий раз

So:

• трудный момент → accusative singular masculine animate/inanimate?
  Since момент is masculine inanimate, accusative = nominative in form:
  • в трудный момент

Yes, Russian word order is flexible, and this sentence is arranged for emphasis and flow.

Current order:

• Меня тоже успокаивает её спокойный голос, а подруга ещё и умеет ободрить в трудный момент.

This order highlights:

1. меня тоже — the speaker is included too
2. её спокойный голос — the thing that causes calm
3. подруга ещё и — an added positive point about the friend

A more neutral version could be:

• Её спокойный голос тоже успокаивает меня, а подруга ещё и умеет ободрить в трудный момент.

That would be grammatically fine, but it gives slightly different emphasis.

Yes. Подруга means female friend.

Russian distinguishes:

• друг = male friend
• подруга = female friend

So this sentence clearly refers to a woman.

Also, because подруга is feminine singular, the verb is:

• подруга умеет

not a masculine form.

It is grammatically just a normal adjective + noun combination, but stylistically it sounds very natural and emotionally meaningful.

• спокойный голос = a calm, soothing, steady voice

In Russian, this kind of phrase often carries a gentle emotional tone. It suggests not only lack of agitation, but also reassurance and emotional stability.

So even though the grammar is simple, the phrase feels warm and comforting.

A learner might especially want these:

• меня́
• то́же
• успока́ивает
• её
• споко́йный
• го́лос
• подру́га
• ещё
• уме́ет
• ободри́ть
• тру́дный
• моме́нт

A few especially useful ones:

• успока́ивает — stress on ка
• подру́га — stress on ру
• ободри́ть — stress on the last syllable
• моме́нт — stress on the second syllable

Stress matters in Russian, so these are worth learning early.