Hi Karilann, the transport chairs with small wheels are really only useful in ideal conditions and for short trips (transport from car to interior/from one airport gate to another...). I have a Quckie light-weight with full-sized wheels that is easy to lift into a trunk. The foot rests pop off, I pull up on the center of the seat and it's folded and good to go. It's about 15 years old and works just fine. I've only had it tuned once, I think I paid about $400 for it.

They claimed it retailed for $1200, but they were able to perform a miracle for me, so I'd recommend holding out for a better price. Also, there are sometimes wheelchairs available at thrift stores but you have to be quite diligent and not too picky on what you get. Because your mom is so small, the right fit will make a big difference in terms of comfort and safety.

Perhaps you could take her to a local supplier and decide which chair and size is best for her, then look for the best price available. I hope you find just the right one.