Hon sitter till höger om mig.

A word-by-word breakdown is:

• Hon = she
• sitter = is sitting / sits
• till höger = to the right
• om = of / from in this fixed expression, so till höger om = to the right of
• mig = me

So the full sentence is literally something like She sits to the right of me.

Swedish often prefers a position verb where English might simply use is.

Common position verbs are:

• sitta = sit
• stå = stand
• ligga = lie
• vara = be

So Hon sitter till höger om mig suggests that she is sitting on my right. This is very natural in Swedish.

Compare:

• Hon sitter till höger om mig = She is sitting to my right.
• Hon är till höger om mig = She is to my right.

The second one is understandable, but the first is often more idiomatic if someone is physically seated.

Till höger om is a fixed expression meaning to the right of.

It is built like this:

• till höger = to the right
• om = of, after this expression

You should learn till höger om as a chunk.

Other similar expressions:

• till vänster om mig = to the left of me
• framför mig = in front of me
• bakom mig = behind me

So in Swedish, om is the normal word after till höger and till vänster.

Because mig is the object form of jag.

English has the same kind of distinction:

• I / me
• he / him
• she / her

In Swedish:

• jag = I
• mig = me

After a preposition like om, Swedish uses the object form:

• om mig = of me / than me / around me, depending on context
• bredvid mig = next to me
• bakom mig = behind me

So till höger om mig is correct, just like English says to the right of me.

Here are some useful pairs:

• jag → mig = I → me
• du → dig = you → you
• han → honom = he → him
• hon → henne = she → her
• vi → oss = we → us
• ni → er = you → you
• de → dem = they → them

So you can make similar sentences:

• Hon sitter till höger om honom. = She is sitting to the right of him.
• Hon sitter till höger om henne. = She is sitting to the right of her.
• Hon sitter till höger om oss. = She is sitting to the right of us.

No, this is normal Swedish main-clause word order:

• Hon = subject
• sitter = verb
• till höger om mig = adverbial phrase of place

So the pattern is:

Subject + verb + place phrase

This is very typical in simple Swedish statements.

Examples:

• Han står bakom mig. = He is standing behind me.
• Barnet ligger på sängen. = The child is lying on the bed.

If you move something else to the front, Swedish follows the verb-second rule:

• Till höger om mig sitter hon.

That is also correct, but more marked or stylistic.

Yes, you can, and it means She is to my right.

The difference is mainly:

• Hon sitter till höger om mig = focuses on her seated position
• Hon är till höger om mig = more neutral, just gives location

If the context is about seating, sitter is usually the more natural choice.

Yes. In natural English, to the right of me and on my right often mean the same thing.

So Hon sitter till höger om mig can often be translated naturally as:

• She is sitting to my right
• She is sitting on my right

The best English translation depends on context, but the Swedish expression itself is completely standard.

Yes, hon is the ordinary Swedish pronoun for she.

For example:

• Hon sitter här. = She is sitting here.
• Hon kommer snart. = She is coming soon.

So in your sentence, hon simply means she.

A simple approximate pronunciation is:

hon SITT-er till HÖ-ger om may

A few notes:

• hon sounds roughly like hoon, but shorter
• sitter has stress on the first syllable: SITT-er
• höger has a vowel that does not exist in English; it is similar to a rounded version of e
• mig in normal speech is often pronounced like mej

So many learners hear:

Hon sitter till höger om mej.

That is normal in spoken Swedish.