Okay, she should be able to do some things. We always go to TL, my DD is older has good upper body strength so she likes the Crush n Gusher slides. Those are pretty much the only slides that have an elevator to go up, but they are like water roller coasters, so pretty wild.
In your case, for either park, I might start by getting a life jacket at the service desk. I think they are free, you just have to leave a deposit. Then, you could probably do the lazy river and the wave pool with some planning. For the lazy river, there are two person tubes available. I would sit your DD in the first hole, and then have you stick your head and arms through the back hole, so that your feet are dragging behind you. You could sit in the second space, but I think the first option would give you more control. You could help support your daughter with your hands and keep her from falling over. But you can feel it out once you get there.
Also, the wave pool is a zero depth entry, so you can just walk right in. I would recommend sitting in the VERY shallow area because when the big waves come, they can knock you over. The bottom is kind of rough, so you might want to get a pair of shorts for your daughter, clothing stores usually sell board shorts made for water near the bathing suits. That's what my DD did. Plus, we got aqua socks (water shoes) for DD because I was worried she would bang her feet and stuff and cut them. They have those cheap at Target and
Walmart.
Finally, given your daughter's age, she might like the kids area. They have some small slides, but also spray jets and things you could sit under.
Have fun!
Mary