I haven't seen a MAP score come back that high for a beginning reader. That lexile score is closer to what most would consider 4th or 5th grade reading. For example, Charlotte's Web is lexile 680 so that would be kind of in the middle of that range.
That's what I was wondering. Does that reading score reflect what she understands? That I agree with. She has always been very verbal and I read aloud to her books way beyond her reading level and she understands them just fine. Lots of audio books too. However, she is not much of an independent reader yet. She can do it but she doesn't do it for fun yet.