The first time that my dd went to the BW pool I thought that she would never go down that slide. I was wrong. I was watching from our room and there goes my dd right down the slide, she loved it. Now I must say that she is a daredevil and loves thrill stuff, so in retrospect it doesn't surprise me that she liked it. I am actually expecting my 2 yr ds to go down it this yr. I bet he will because he follows dd around everywhere and wants to do what she does, so we will see. Just so you though there is a kiddie pool. Also you can check out a life vest for the length of your trip. I don't know though if that is a DVC perk or if everyone stays there can do that, it's free....
One last thing, the slide if she decides to try it, have two people go up with her. You go down the slide first and then stay there to catch her, that is what dh does and after she goes, I just either go down the slide or turn around and walk down the steps again. The point being, you will not be able to ride the slide with her.