--Outside the house ideas:
-Going to the library, checking out some craft books.
-Go to the mall and go shopping or just look around.
-Go to a nail salon and get a manicure/pedicure.
-Go to a zoo, sporting event, music concert, comedy show, museum, etc.
-Get some coffee/hot chocolate at a coffee joint and people-watch.
-Volunteer at an animal shelter, food bank, or some other place.
-See if there are any places in your area that host social gatherings (dances, movie nights) for people with disabilities.
Inside the house ideas:
-Do an at-home manicure/pedicure/makeover
-Send happy cards to kids with terminal illnesses (check out hugsforhope.org)
-Do some Mad Libs.
-Go outside on a nice day and blow bubbles.
-Everybody loves doing tie-dye!!
-You can always do the baking/cooking thing and then hand the goods out to a homeless shelter or the neighbors. If you've got permission from the family, maybe even have a bake sale. And if she's got use of her arms (or do hand over hand) she can help with stirring and such.
-Do hand over hand painting and coloring.
-Find a recipe online to make your own lip balm.
-Help her make something in time for Mothers' Day (Sunday, May 12)
-Plant some seeds and watch them grow.