Welcome Pru!
I'm not familiar with the tests you have there, but here's a link so you can get an idea of your DD's lexile level:
http://www.lexile.com/findabook/You can punch in her number there, and then choose books based on her interests. The numbers you give are within the middle-school range, so yes, high for a 2nd grader. The 99%+ in Reading likely means it's high enough so it can't be calculated with any specificity beyond 99%.
Is your school doing anything to differentiate for her reading? I can tell you that my DS7, in a school for HG kids with a similar lexile level, is currently reading The Black Pearl in his reading group. If your school can put your DD in a group with other kids with similar levels, and give them material at their level, that would be great.
Have you talked with her about how things are going at school? I guess I'd be concerned with the routine stomach aches. Maybe you can try to find out what she likes most and least about school to try to ferret out the troubles? If she's doing basic 1st grade materials, that is probably quite inappropriate and could cause anxiety. Have you talked with her teacher to see if she has noticed anything?
Will the school psychologist do any testing for you if you ask? That's a less expensive first step. We got some private testing done before our DS entered school, and then the school did has done the rest of the testing since then.
Good luck. Hopefully others here will know more about the particular tests.
