Try this...
Not sure if more ideas were requested, but here are a few things I've done in the past for people with varying arm/hand problems:
-For folks who have one arm significantly shorter than the other, get 2 stems (one shorter by however much you need) and simply stack them one on top of the other on the steerer. You can do quite a bit of adjusting to get just the right reach for each arm this way. Cut a handlebar in half (the clamp area is usually wide enough to do this, if in doubt use 2 bars) and mount one half on each stem. You can also make one bar wider than the other side if necessary. Works great!
-For those who need to do all braking/shifting with one hand, there are a bunch of possibilities.
-Use a trigger shifter and gripshift together (or grip/trigger+thumbie or bar-end shifter) to allow use of a full drivetrain. 2 rear shifters will work fine with a little fiddling.
-Use a Rohloff hub to allow all shifting from one side ($).
-Use a BMX lever designed to pull 2 cables (
www.danscomp.com), and make sure that the rear brake engages a little earlier than the front. With oversized rotor mechanical discs, this works amazingly well.
I'm always impressed by what people can overcome! Kudos to your GF for getting out on the bike!
-Walt