Next week I will be taking my boys to WDW to celebrate their 4th birthday (May 7th). This will not be their 1st trip (that one was in vitro

, really!).
Our most recent trip was this past December. I think 2 days at MK is a good idea. It will be a very busy weekend, the weekend of Thanksgiving, so you may have some lines to deal with.
As was mentioned previously, 1/2 day at DHS (formerly MGM) is a good idea. We go for a few hours, never a full day. They have a great Playhouse Disney show, Ariel and Beauty and the Beast shows. DHS also has a nice Playhouse Disney breakfast with characters, if your daughter is really into Playhouse Dis, but approaching 4 she may not be...
When we go to Disney now (at this age) we start out at the train, it's right at the entrance of the MK. We take the train to Toontown, which is next to Fantasyland. Both these two areas are age appropriate for rides and interest. Toontown will give you possible opportunities for character visits, like Mickey & Minnie. Great photo opportunities! Also great, b/c you are hitting them early before people/kids are too tired or dirty. The boys are old enough to walk around initially, but then after spending a few hours in this area of the park, we walk down towards Main Street to pick up a Disney stroller. By then the boys are slightly tired and willing to ride in the stroller without feeling like their are giving up their independence.
I've noticed for this coming trip, that my boys have just reached 40" which allows them to ride a couple of new rides (ones Mommy and Daddy like). The two that I am thinking of are Splash Mountain and Thunder Mtn. Railroad, those are in Frontierland, and once we pick up the stroller, that's usually the direction we head back again.
Do you know where you are staying? On site, or off? Depending on where you are from, the end of November might be too cold to swim. It would be for us, but we live in FL now, and our blood has thinned considerably.
It was suggested previously that you surf this board for information. This is the GREATEST board in the world with the GREATEST people. You will be amazed how much interesting and unique information you will pick up from Disboards!
Since you are just doing 3 days, I would just do DHS and MK, especially at her age. The crowds might be a little stressful, and you don't want to have to feel pressured to see this here and this there, etc. Take your time and enjoy. But prepare yourself, you may just

become a new Disney addict!