Let's see... at Animal Kingdom, to avoid the heat, I'd highly recommend seeing the parade in the Discovery Island area. At least you can be under the shelter of the roofs of the shops (if you get there early enough).
This year I saw some people camping out on Main Street for Spectro at Magic Kingdom 2 hours early! No way in the world I'd ever do that. Meanwhile, we got off of Big Thunder just as the parade was entering Frontierland and there were plenty of good viewing spots available there (that said, I much prefer watching the parade from Main Street). Go to the 2nd one if there are 2, and you can find a good spot even 5 minutes early. The afternoon parade there is crowded regardless.
The parade at MGM seems to be best viewed from the Sorcerer's hat area (the right side if you've got your back to The Great Movie Ride); not as jammed up as the Hollywood Boulevard viewing areas.
That being said, allot extra time beyond what I said if you're planning on letting her stay in her stroller. It's fairly easy to get "standing room," but stroller room is another thing entirely (something I have no experience with; hopefully someone else does). I can get there 5 minutes early and stand behind one row of people and still see well, but I'm 5'7".
I hope you all enjoy your trip! Personally I've always loved parades, and I hope your DD does as well.
