When you don't like your new bike, female content (modern geometry?)

@el_boufador quite possibly, it looks like that's maybe it.

@wbo she really liked a 2017 / 18 Nukeproof Mega which she rented years ago, but then the geometry changed. She didn't like them anymore after trying the newer ones.

As someone who has gone from a relatively conservative SC Hightower V1 to a LLS Cotic Jeht i can certainly attest to the idea that it takes quite a bit of adjustment to keep weight forward and "ride the front fork" if you don't, and just lean back you find the front wheel does try and escape and feels light.

Id suggest just getting her to pull herself / lean forward a bit more. If a longer stem helps with that, which i am sure it will, then thats the first thing id start with.