J.S.
A ride on toy that she can also push. We like the winnie the pooh 5 in 1 or grow with me (I can't remember). It has a rocking base, or w/o it has wheels and you can attach a handle for you to push them or they can sit, push themselves or get off and push the toy.
Stacking blocks, nesting cups or boxes and first crayons are all good options as well.