Actually there was never a Yenta who misbehaved – I thought that was the case until I looked into it. There was a miserable Yiddish “playwright” or “novelist” who used that name for a negative character in a play that unfortunately became popular during the days of the Yiddish theater. A menuval of a “columnist” at the Yiddish “Forward” of old picked up on it and used it as the pen name for his gossip column because he was male and had to pretend to be female. That is what ruined the name.
If those names don’t work, the only suggestion I have left is Tova Gitta. Good is close enough to the original meaning of Yente and if you want to retain the Yiddish Gitta is the closest variant sound-wise to Yenta. Eden is from the same root as Adina (I think – I cannot spell in loshon hakodesh and I could be mistaken) but as a name it doesn’t sound too great and Edna is very dated.
You can also try to pull the wool over your mother’s eyes and use an incorrect etymology for Yenta, which is to define it as the feminine for Yom-Tov, and then use the name Chagit. I have seen this – I did not make it up – but it is incorrect and contrived.
Juanita – LOL – the Yiddish feminine name that corresponds to Juanita, which derives from Yochanan, is actually Yachne!!!!