The Borg baby was Ramuran.
This is why no one seemed to remember her after her initial appearance. Note that her ears aren't visible under her cranial implants. The Borg baby was adopted by Marla Gilmore.
The former Equinox engineer was seeking redemption, tired of fighting, and missed her kid nephew. We didn't see her again after she joined Voyager's crew, because she was busy with her new daughter.