How does Jenny Quantum do against...

Marvel's reality warpers?

Franklin Richards?
Molecule Man (current)
MJJ
etc...

.

She loses.

She'd get stomped hard by those... well idk about the current Molecule Man. Maybe she'd fare better against him.

She should lose to them all, given their power sets and levels. She can boast some reality warping (probably, depending on interpretation), but not on the scale shown by anyone here.

the listed ones would beat her.

legion, sw, even braddock should beat her. she could beat proteus however