What is the appositive phrase in the sentence "my neighbor, little sierra, threw rocks through her parents' window "?

An "appositive" refers to a "noun" or "noun phrase" that renames another noun right beside it.

In the sentence given: 

"My neighbor, little Sierra, threw rocks through her parents' window." ; 
    ,

the phrase: "little Sierra"—renames the noun: "neighbor".

As such, the phrase: "little Sierra" is an 'appositive phrase'.

jessica, a teenage girl who just wants popularity, does everything to get attention. she puts her hair in a bun and steals her mom's lipstick and such. but then she takes something and it makes her inside and outside appearance  go bad.

i just came up with that in less than 60 seconds, but tweak it up if you like it.

explanation:

you didn't give a theme but i did a question like this a while ago so i hope this is what you were looking for.