Loss of Balance due to Brain Aneurysm.

It has already been 13 years since my mother's operation because of brain aneurysm and she lost her balance and coordination. She can't walk well since then and she has a speech problem. Although she can walk with the help of a "walker" or when she's holding the walls or something. When she tries to walk, she always falls down and she's very slow. She has undergone therapy before but it stopped already because it's too expensive for us. She also gained weight because of physical inactivity. I really want to know if there's any chance that she could regain her balance and walk again on her own. But it's already been 13 years so I'm already losing hope. Thank you for your help. I really appreciate it.