nero, In my area we have something called senior citizen's day care. A van/bus comes by and picks the person up and takes them to a local meeing area where they have bingo, reading, knitting, etc. I know several who do this and they enjoy getting out and it provides a little bit of independence for them. They even have lunch served w/snacks.
You might want to check out the local "elder care" organization to see what they offer. Your mother needs to be interacting w/other people and not just people her age. She needs to feel needed and wanted, i.e., putting in her "value added" time.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.