I don't think you have to worry. My DS scored well above the 95th percentile on the Fall MAPs when he was in K. He has similar FSIQ numbers as your DS when he was tested on the WISC at 7. He did not do quick math facts - still is not that fast- but could (can) do lots of math in his head. I just asked him and he said they speak the question and he remembers most of them being word problems. I think the key is to let her know to take her time and that she may see her classmates finish well before her - if she likes tests at all, she will likely enjoy the MAP - my DS says it is lots of fun. My DS has always done well on the MAP and has done the WJ III and they seem to be consistent so I think it is a fairly accurate reflection of his abilities. I would not worry about the outside testing at this point - see how she does and if you don't think the MAP scores truly demonstrate her achievement, you can get further testing after.
Good luck.