Welcome -
In general, early-onset Crohn's is associated with an aggressive disease course, particularly in children diagnosed after the age of 6. The accuracy of this conclusion is limited since there is a much smaller incidence of IBD in children under the age of 6.
You don't say how sick your daughter has been since her diagnosis or what treatment she has received. But if her disease course has been severe to date then it is likely that it will continue along that path when it is active.
The research info on familial disease patterns is mixed and very sparse at this point. So far there is no conclusive evidence that a child's disease course will be more or less severe than their parent's although the trend seems to be toward a similar disease course.
There is a lot of research being done trying to find serological and genetic indicators that will allow prediction of severity/disease course. Of these, the serological markers are so far the most clinically helpful because the genetic markers have turned out to be numerous and none so far have been shown to have a really strong affect.
Serological testing (such as the Prometheus serology testing panels) generally shows that the higher the number of markers a child has the more aggressive the disease course is likely to be.
None of this is set in stone and the biologics may make a huge difference in the impact of CD on pediatric Crohn's disease course in the long run. But it is too early to say for sure if that will be true.
I would like to invite you to check out an online support forum for parent's of children with IBD. It is not a HW forum.
www.dragonpack/ibdsupport/parents/You may also want to look at the current clinical trials in pediatric CD and see if anyone is investigating familial inheritance patterns. Then you could either e-mail the prinicipal investigator, look for publications by that person or consider joining the clinical trial in hopes of getting the latest "inside" scoop.
Best wishes -
Patricia