You don't work today? Nice "easy," practical project getting the car running? Your niece or nephew? Do you have some little toy or rattle your mother can give to the baby? She might like that? My stepmother and I use to do that for her mother, get a "collection" of cards so she'd have birthday cards, etc. to give/send with a bit of a choice, something for her to "do" and feel like she could do. If the 1/2 sis lives in the area you might get a little collection of baby books, rattles, etc.; 4-5 things so your mother has some little new thing to give the baby. Older women often like that I think, makes them feel more participatory.