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Foremilk is more watery to satifsy a babys thirst and Hindmilk is thicker and richer (Fattier) to satisfy hunger. If she is in the 95th percentile and doesn't get fussy at feedings it sounds like nutritionally she is getting what she needs.
If you start offering only 1 breast at each feeding your body will adjust to that and only produce milk accordingly. If you decide to go back to feeding from both sides your body will adjust to that too, although it will take some time for your milk supply to "catch up".