Kelly0523, do you feel the school has been adequately challenging your DD in reading? Does she select some challenging reading material on her own, or does she prefer books well below her lexile level (being an avid reader definitely helps, though!)? It sounds like she is making nice progress in all other areas in school, but I would want to take a look at what she is/has been doing in reading to make certain she continues to make progress. Her early scores indicate that she would have needed something "well beyond the norm" for second and third grade reading to progress. Did the school somehow differentiate for her or can they do that for her in the future?
My DD had similar scores in 2nd grade. The school did some differentiation in reading (including daily pull-outs with an enrichment specialist), but I also think just being an "avid reader" (like your DD) helps. From what I understand, MAP scores can dip and then rise higher, so I do not think any one score is overly concerning.