I think the frame/mug is an appropriate gift... useful but not too personal, thoughtful without going overboard.
The only reason I suggested that perhaps you should evaluate the notion of giving her a gift is you stated in a previous post that you had to give her something "in return" because she purchased you a gift. To me gift giving is because you WANT to give a gift, not to get something in return or due to a sense of obligation. IMO a plate of home baked cookies or fudge that you and the girls made would be a lovely gift.
