1) the 2 grades above is compared to where her age mates are, not her current education level, so if she is 4 and should be in pre-k then they want to see her doing 1st grade work or higher, which doesn't sound like it would be a problem.
2) Even though the school is working right now (and congrats for finding one that works), it may not be in the future, so their educational consultants would be helpful then. There is also her social and emotional needs that DYS help with - explaining to you how to do deal with them as well as giving you resources for her. It also allows you to go to the young scholars family summit in the spring, where she could meet tons of kids like her and give you a social network of other parents who have pg kids too. There are also webinars she can participate in.
3) I don't have an answer for this one, sorry.

We haven't used the DYS consultants much, but when we did they were very helpful and my daughters love the summit and the friends they meet there.
Hope this helps.