I don't think you can go wrong either way. Tell her I think the kids would really LOVE ASMovies!!!!! The resort is not THAT spread out , so any location would be nice. If you aren't going at a busy time, request the Toy Story Section or Dalmations. Request the three rooms be adjoining with two connecting (for their family) You won't need a car here. The bus transporation is excellent.
Here is a HUGE plus for the two rooms (we have done it three times). For them, it will be like having a suite. When the kids are napping or asleep, the adults can stay up, watch TV or whatever. the two bathroms is REALLY nice. One night my nephew (16) was up sick all night and we didn't even know it (he was in his own room). If he were in our room, I think we ALL would have been up! With two bathrooms, baths and everything is much quicker. We stayed at AKL in a deluxe room with a queen, bunk, and daybed (just 3 of us). It was a very large room. Even though the room "sleeps" five, I would never have made it for a whole week in there with five people!
If it's the cost, maybe you can offer to pay for half ($65). You will be saving $200 and like I said, you realy don't need a car. With that many traveling together, the buses would be easier. Her 3yo will need a lightweight (umbrella type) stroller.