彼女に兄弟はいない。
tbd
She doesn't have any brothers.
She doesn't have any siblings.
She has no brothers.
She doesn't have any brothers or sisters.
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兄弟， きょうだい， けいてい
1. siblings, brothers and sisters
2. brothers
3. siblings-in-law, brothers-in-law, sisters-in-law
4. mate, friend
手足，兄弟姐妹
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd