Con una sola mirada y un gesto amable, mi abuela entiende que estoy cansada y que necesito descansar.

Con means with. Here it introduces the way the grandmother understands the situation:

• Con una sola mirada = with just one look
• y un gesto amable = and a kind gesture

So con tells you the means or accompanying action.

Una sola mirada means just one look or a single glance.

The word sola here adds the idea of only / just one. It emphasizes that one look is enough.

Compare:

• una mirada = a look
• una sola mirada = just one look / a single look

Because sola agrees with mirada, and mirada is a feminine singular noun.

Agreement:

• mirada = feminine singular
• so the adjective must be sola

Examples:

• un solo gesto = a single gesture
• una sola mirada = a single look

In Spanish, most descriptive adjectives normally come after the noun.

So:

• un gesto amable = a kind gesture

Putting amable before the noun would sound unusual here. For a learner, the safest pattern is:

• noun + adjective

Examples:

• una persona amable
• un gesto amable
• una voz tranquila

The first part of the sentence, Con una sola mirada y un gesto amable, is an introductory phrase. The comma helps separate that opening phrase from the main clause:

• Con una sola mirada y un gesto amable,
• mi abuela entiende...

In English, you often do the same with longer introductory phrases.

Entender que means to understand that.

So:

• mi abuela entiende que... = my grandmother understands that...

After verbs like entender, creer, pensar, saber, Spanish often uses que to introduce a new clause.

Examples:

• Sé que viene. = I know that he/she is coming.
• Entiendo que estás cansada. = I understand that you are tired.

Spanish often repeats que when two full clauses are joined after a verb like entiende.

So this structure is very natural:

• entiende que estoy cansada y que necesito descansar

It helps show clearly that there are two things she understands:

1. que estoy cansada
2. que necesito descansar

You may also hear:

• entiende que estoy cansada y necesito descansar

That is possible, but repeating que is often clearer and very common.

Because estar is used for a temporary state or condition, and being tired is normally temporary.

• estoy cansada = I am tired

Using ser here would be wrong in normal Spanish.

A useful rule:

• ser = identity, essential characteristics
• estar = states, conditions, locations

So:

• estoy cansada = I’m tired
• soy alta = I’m tall

Because cansada agrees with the speaker, the person saying estoy cansada.

This sentence suggests the speaker is female.

• If the speaker is female: estoy cansada
• If the speaker is male: estoy cansado

Spanish adjectives usually agree in gender and number with the person or thing they describe.

Because Spanish often leaves out subject pronouns when the verb ending already shows who the subject is.

Here:

• estoy = I am
• necesito = I need

So yo is not necessary.

You could say:

• yo estoy cansada
• yo necesito descansar

But that would add emphasis, contrast, or emotional stress. In neutral sentences, Spanish usually omits yo.

Because necesitar is followed directly by a noun or an infinitive, with no extra preposition.

Patterns:

• necesito agua = I need water
• necesito descansar = I need to rest

So after necesito, the infinitive descansar works like to rest in English.

Because after necesito, Spanish uses an infinitive to express the action that is needed.

• necesito descansar = I need to rest

This is very common in Spanish:

• quiero dormir = I want to sleep
• puedo entrar = I can come in
• prefiero esperar = I prefer to wait

The infinitive is the basic verb form, like to rest, to sleep, to wait.

The subject is mi abuela.

So:

• mi abuela entiende = my grandmother understands

Even though Spanish often omits subjects, here the subject is stated explicitly.

Yes, the word order is natural and very Spanish.

Current order:

• Con una sola mirada y un gesto amable, mi abuela entiende...

This puts the descriptive introductory phrase first, which sounds smooth and expressive.

You could also say:

• Mi abuela entiende, con una sola mirada y un gesto amable, que estoy cansada...

But that sounds less natural and more interrupted. The original version is better.

It does both.

First, it joins two noun phrases:

• una sola mirada
• un gesto amable

So:

• Con una sola mirada y un gesto amable

Then later it joins two subordinate clauses:

• que estoy cansada
• que necesito descansar

So in one sentence, y connects both:

1. two things
2. two full ideas

Yes, grammatically it could be omitted if the context already makes it clear who is being talked about.

For example:

• Con una sola mirada y un gesto amable, entiende que estoy cansada...

But without context, that could sound unclear because entiende could mean he/she/you (formal) understands.

Including mi abuela makes the sentence clear and natural.

Not always. Amable can mean kind, nice, pleasant, or friendly, depending on context.

Here, un gesto amable is something like:

• a kind gesture
• a gentle gesture
• a warm gesture

So kind is a very good translation here, but not the only possible one.