Unfortunately, I can't comment on Remicade with regards to children though I have had Remicade infusions myself in the past. Is your daughter taking a probiotic? If not, I would like to recommend using culterelle, which has helped many on this board regain formed stools.
If you don't mind me asking, has your daughter ever taken antibiotics?
Can you possibly create a signature with a list of meds, etc. that your daughter is on?
Diagnosed with Ulcerative Colitis January 2007
Remicade, Primal Defense Ultra, Multi-vitamins (also iron, B12, Magnesium and Zinc), Flaxseed/Natures Bounty Fish Oil
Swanson Ultra Caprylic Acid (natural anti-fungal) 600mg x2 daily
Carrot & Garlic supplements (natural anti-fungal) x2 daily
Currently taking herbal meds in the search to regain full health.