My mother has Dementia. Are there any activities that she can do ? or if we can indulge her in them?

Help her memory power. Sure, What happens is,

After understand their needs, we can give them things accordingly.

What happens is, we set a general blanket. But we cannot generalize things for them.

If we are attending their memory, we will have to give them memory exercises first.

After getting up in the morning, if you talk to them, tell them the date, if theres any festival

Give them an old album and discuss the pictures in them. These are simple discussions.

Listening to old music, talking about them. You have to attend three things,

Activate their memories, keep them relax. This way you can solve their problem in a greater way.