彼女の住所が

her address

→ 彼女
phrase Rare #37,321
her address 彼女の means “her,” and 住所 means “address.” が marks the phrase as the subject of the following verb or adjective, so this term usually appears as part of a longer sentence.
JA: 彼女の住所が変わった。
EN: Her address changed.

彼女の住所が分からないの

I don't know her address.

どうしても彼女の住所が思い出せないんだ

I just can’t remember her address, no matter how hard I try.

彼女の住所が分かった

I found out her address.

— フォーリング・ダウン (1993)

もし彼女の住所がわかっていたなら彼女を訪問できたのに

If I had known her address, I could have visited her.