It doesn’t sound like your mother qualifies for Attendance Allowance, if she doesn’t require care at the moment. If you look at eligibility, you get a broad idea on the criteria:
If she needs help dressing, and needs supervision or help preparing food for safety reasons, then you might just have a chance. Otherwise don’t bother.
if she is on low income, grants are available to help with adapting bathrooms, or fitting stairlifts. This is through the local council, so it’s a bit of a lottery these days.