Hi there-
I have been doing the Remicade treatments since 1999. I was diagnosed with Crohn's when I was 26, and I am 39 now. The Remicade has kept me flare free since 99. I am not sure what the age requirements are for the treatment though. I have not felt any side effects at all, except for feeling a little tired for a couple hours after the infusion.
I am not aware of it costing so much. I believe my entire treatment, which is done at the hospital every 8 weeks, costs roughly $2000. I can not be exactly sure, for my insurance covers it 100% and I do not see a bil.
As far as your child having to pay for this out of pocket when she leaves home, that may not be the case. Most employers that offer health insurance to their employees don't normally have to disclose pre existing conditions. The only time that she may have to is if she joined the policy after her employment began and not at the hire date. This is how it is in the state I live in.
Hope this information is helpful, and you may to search online like the docotor suggested. There are some very informative info out there, and some scary stuff as always. I am always willing to discuss my Crohn's expierence with anyone who it may help.
God Bless!