The parks can be kinda overwhelming for the younger kids... I would recommend doing MK for a day, but take your time through the park and gauge how your DD will warm up to the characters... Some kids can handle it, others can't.. (My DS freaked out at Tigger at 1.5yo, but was hugging Buzz Lightyear by 2.5 years..)
Other fun things...
1) Go to Fort Wilderness.. There is a petting zoo, wagon rides, s'mores, etc...
2) Spend some time at the Community Hall at BWV... While I can't remember how many activities they have for infants, you may be able to color a picture or two...
3) While at DD, bring "swim" diapers... There are fountains there that the kids can walk or run through to keep cool...
4) Pool Hop... Check out the other resorts... SSR has a nice sprinkler fountain.. BWV has a nice kiddie pool and playground... While at BWV, stop by the bakery and pick up some carrot cake... hmmm...
5) If you want a character experience that is not overwhelming, try eating at Gulliver's at WDW Swan... They have character dinners there every night, with buffet service... (Plus
DVC members get a 20% discount.) The characters make it a point to stop by every table, but aren't always in your face if the child is sensitive.