My son is also 8 and weighs 105 lbs. He eats constantly but he does because he has oral sensory issues. Does your daughter receive any physical or occupational therapy through school? An occupational therapist can help with things that alleviate the oral sensory issues. One thing you can do is give her something else to chew on (a teething ring, a chew toy, gum) to see if that helps. Even ice is good.
One thing I have tried really hard to do is not have junk food in the house because he has no impulse control (he too was premature and has autism and ADHD).
Her diet will cause her to be constipated which is likely why she needs a stool softener.
Hope that helps! Good luck!
Are you serious?...lol. I have been asked by several teachers and doctors abot her seeing an occupational therapist! Not related to her eating but, other developmental issues. It's funny you say that because she does have sensory issues. When she was in NICU it was always quiet so now she acts out when she hears loud noises. We got put out of the circus, the movies,...etc. When she was in the incubator, she just slept with a t-shirt and a diaper; even now she will not sleep with any clothing below the waist. I'm so glad that you said that. I will be getting her an appointment quick. Thank you so much!