K.P.
Try some leave-in conditioner and a little hair spray. Her hair sounds like my nieces' hair! I finally asked my sister if she actually brushed their hair at any point because they ALWAYS look like they just got out of bed!
We played around with it and found that shampoo with leave-in works better to keep the tangles at bay. When it's dry, spray a little bit of hairspray and then brush it through. The spray gives it a little bit of "grit" so it doesn't knot so easily!
She also uses teeny tiny rubber bands and pulls their hair up as often as possible (also in FL so it's HOT). Pig tails up "high" are best because they can't pull them out as easily!