The gene pool needs a life guard.
@ 5'7" I can comfortably hang from trees about 22' apart, (Minimum butt to ground distance: about 12") much farther & I really can't get the straps high enough. So, like a few mentioned above, she should hang from trees closer together than you do. AND, Possibly, get a shorter hammock than the WBBB. She is the "perfect" size for a grand trunk Skeeter Beeter UL, which is about 14" shorter than the WBBB. At my size I'm about 1" - 3" short of being too tall for it, so should fit her just fine, this would allow her to choose trees even closer together AND it is a hammock that is a bit lighter & smaller packing for her smaller frame.
Keep us posted on her progress. I'd hate to see someone go back to the ground, ouch!
FWIW, Ive never pushed my straps up with a stick, I just find tree spacing that's better suited to my lack of stature.
When you have a backpack on, no matter where you are, you’re home.
PAIN is INEVITABLE. MISERY is OPTIONAL.