Which park are you going to go yo?
At MK, try PeterPan, It's A Small World, Winnie the Pooh, Magic Carpets of Aladdin, Dumbo, or Pirates of the Caribbean. Although Pirates has that small drop, so I'd ask a CM first. You can hold your DD on your lap during these rides, since they are so gentle.
At Epcot, you can do Spaceship Earth, and El Rio Del Tiempo (the ride at Mexico). It depends on how she'd be with loud noises. If she's okay, try Imagination and Ellen's ride. Also the Living Seas would be nice.
At MGM, any of the small shows are nice. The Great Movie ride is nice too, but it, again, depends on how she takes loud noises.
At AK, there isn't much to do. Maybe the Lion King show, the walk through jungle tours, if she likes animals, and some of the other small shows, like the Pocohantas show.
I'd check with a CM before riding these rides, to make sure they'll allow young kids on. Since you've been to WDW a lot, so I guess you know a lot about the rides.
Have fun with your DD!! And have a magical time
