She would not have An eating Disorder at 9 months old, she needs to see a pediatrician. If she is not eating at all and has not for awhile consumed anything I would consider taking her to someone soon.
There is an "Ask a nurse" forum on Medhelp as well that might help
how many feeds does she have a day? she may be cutting down now due to solids, health visitors say baby should 500 mil a day, my son is 7 months and he was on 6 bottles a day now only wants four because his food fills him up, speak to your health visitor if you get worried
I would talk to her pediatrician, or at least post to a forum on baby health. I would seriously doubt she has an eating disorder.