I would challenge the argument that “she likes 4 colleges equally”. I would create a schedule of the 4 colleges and list out pros and cons of all 4 colleges and see which one has the slight edge in the results. That is the one I would ED to. This way she will have to regrets.
With that said, there is no requirement that she has to ED to ANY of them. I’m sure the 90% college will likely accept her in RD too as she has strong stats for that college, obviously.
The good news is there is no wrong answer and it’s great that she has 4 excellent colleges and strong safety that she likes.