i've got my mum a Karen Millen bag, she tends to hint at what she likes though, saying things like 'ooohhh isn't that nice, i couldn't justify it for myself though...' Everytime we walk past it!
Boots have their 3 for 2 offer on, and there are lots of nice ted baker and sanctuary spa bath stuffs in the offer which would make lovely presents. you could then give her some vouchers that way she has something to open on the day and can then go out and get something she really wants in the sales.