I also have to use a xbow;because of a disibility.
I have a Barnett Quad 300,and love it. it is 150lbs. with 21" stroke. as mentioned the only difference as for mantiance is the rail needs lube regularly,every 10 shots or so.
you can also get a cocking device if she is unable to cocke it.

I use alumnuim arrows,spitfire 3 blade 100 grain mechinacals.I have taken 6 bucks with mine,no problems.

I don't know about the others(I'm sure there are other great ones)Barnett has a great warranty,it something goes wrong they fix it ,no charge.

good luck in your search for the right one for her. glade to hear she wants to hunt.help her any way you can.<img src=icon_smile_approve.gif border=0 align=middle><img src=icon_smile_cool.gif border=0 align=middle>

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.