Hmm, obviously depends on what kind of person your mum is, but for my parents last year I got them little glasses holders for around the house. As they get older they need reading glasses all over the house, and this was a cute thing that is also useful! The ones I got look like little people with a big nose you can put the glasses on top of, but I know you can get those in all kinds of shapes. Just a little idea 🙂 otherwise you could get her a spa day or a massage coupon, if she is more into experiences than material gifts!