Hmm ... if it is powerful enough for her needs, there is a nice interchangeable motor tool by Rigid for which one head is a right-angle drill. It is powered by 12V Li-Ion batteries. The primary thing comes with the motor, battery, charger, and one of those vibrating saw things which are nice for cutting drywall and other things (Plus detail sanding, but I have not used that function on it yet -- nor the metal cutting blade).
Oh yes -- a very nice warranty for the batteries. Be sure to keep the packaging until you know what you need to do to register the batteries. My wife was too quick at cleaning up. :-)
The right angle drill has plenty of torque, and I use it as a power screwdriver for larger screws.
The basic kit comes with the R8223404 "multi-tool" head. The drill head is R8223402, and the hammer (which works nicely in confined spaces) is the R8223405. The whole series is called "JobMax"
The initial set, with the JobMax multi-tool head comes in a zipper closed fitted cloth bag, and it is just barely possible to close it with the two extra heads and a spare battery carefully wedged in. There are a couple of other heads which I have not bothered to get, including an impact wrench one.
Hmm ... looks as though there is now a corded power module to use when you are running a long time, so you don't have to keep spare batteries charged up.
Here is the starter kit at Home Despot:
with the kit part number being: R82235.
The one review with the broken tab for locking the battery in must have done something wrong. It is well protected while in the tool in my opinion.
Here is Rigid's site covering the system.
Here is the Home Depot for the drill head
And here is the hammer head, if you are interested in tossing it in:
And here are a set of reviews of the system:
Good Luck, DoN.