What's a good bat mitzvah gift when you don't know the girl that well, and....

It makes a difference when I know the young person. I’ve given 2 bracelets, a watch, a stock share ( Intel, then worth $76). , etc. otherwise, I just do the $$

I am not a cash fan either for a religious celebration. A personal gift and $18 or a amazon card seems like a nice compromise. I still have the opal ring a family member gave me for confirmation and I treasure it.