Hi M.,
This is Mamasource and you are trying to help your Mama. It is totally appropriate to ask this! NO one would want to go thru hip surgery again....and I don't think 1/4 inch longer leg is a good reason to do it. Many people have a leg longer than another and adjust to it fine. Chiropractic can straighten an alignment that may be causing the problem if you want to go that route.
I don't know how old your mom is but if she has any age on her at all, anesthesia can "throw" her into dementia. That is a COMMON fact that doctors don't tell you (but, all nurses in rehab WILL tell you!). I had to "detox" my Mom for over a year to get her back to normal after hip surgery. If I had known what the anesthesia was going to do, we may have made a different decision.
Unless there is a dire need for surgery, I would not attempt it again. A hospital is a horrible place to be if it isn't completely necessary.
I hope this helps and if you need any support in your decision, please don't hesitate to contact me!
M. Howe