Q: She's turning 90. I'm in my late 20s. I'd like to keep the cost below $100 and it can't be too big because she lives in a very small apartment.
A: 90 year olds don't really want any presents- epically since you are young they never want people to spend money on them- my grandmother has started giving all her possessions away. All they really want is you to spend time with them- so I would say to make her a coupon book for things you can do for her. Ex: take you shopping, go to bingo, take you to dinner, go see a movie, etc. She will LOVE that more than any gift you could give her I guarantee you (unless she's one of those who don't leave the house then think of other things to do!) give her that and a nice bouquet of flowers with a balloon and card.