How old. What is her life like, is she retired / work part time / etc.
My mom is a Nurse (LPN actually but I say nurse cause it sounds better). She has recently started on the whole "internets" thing. When I am at work she is constantly msn'ing me things. Like whats the weather like in Calgary, when are you getting married, I have this nurse I foudn for you - I showed her your picture blah blah blah - things like that which make you wish you never singed them up for this msn messenger in the first place.
But anyways, back to topic. I got her a netbook with webcam. She loves that thing. Takes it to work to surf the web when she is on break (instead of what she did before, who knows what). I got it for her last March, so that would have been her 54th ? birthday so not a big milestone but none the less.
The year before I (me, my dad, and my brother) booked her and my sister a 2 day spa weekend in Banff). I find that with a younger sister, its always good to get her a gift as well at random times. It also works out well with my mom so then she isnt alone when she does that stuff