I have a son (5.5) and daughter (2.9). Based on what they love:
Puzzles - there are some great 3' x 5' melissa and doug puzzles that my kids play over and over.
Building toys are great - lego duplo, or building straws (the connectors are small and you may not feel comfortable at her age - my daughter plays with them next to her older brother and does not mouth them: http://www.amazon.com/Roylco-Straws-Connectors-230-pc/dp/.... On the more expensive side - a leapster explorer.
Size of the marbles may cause you to wait on this one - all time favorite toy - marble run: http://www.amazon.com/Galt-America-A0560E-Super-Marble/dp...
Does she like dolls? My daughter as a small mcclaren stroller and uses it all the time, as well as a shopping cart (the shopping cart comes in handy in countless ways, for she and her older brother).
How about an easel?
Finally, there are a lot of indoor games for rainy spring days like today - one we have lots of fun with is knee hockey (the "puck" is a hollow plastic disc with foam around the edges) http://www.amazon.com/gp/product/B000OACWPM/ref=ox_sc_act...