1) Anything diet or fitness. This is a no-brainer
2) Wrinkle cream. Obvious reasons.
3)Cleaning products or supplies. No one should need an explaination why to this.
Be creative and show your love and appreciation. And this doesn't always mean spending lots of money.
Buy her a card, make her dinner at her house, do her laundry and dishes and maybe wash and vaccume her car. It won't cost you much more than simply your time.