Is this nutritionist in practice with your GI? Is she a registered dietician? People with Crohn's really need a dietician. They are specifically trained to deal with people with medical issues. A nutritionist does not necessarily have the training and education or the national certification that an RD has.
I have heard of those packets of vegetables. I ran them by our physicians and while they all said they would not hurt, none of them were able to find peer reviewed scientific research on them and they all doubted they would help her IBD.
As to the feeling normal...well, that comes with time and healing. Honestly, once in remission there is very little that is different between them and their friends. After the first year or so my daughter ate what she wanted, attended school regularly, was in many clubs at school, church youth group and on the Varsity swim, cross country, indoor and outdoor track teams. She is off at college now and living a very full and complete life and this is even with a flare that has lasted almost two years now.
The only things my daughter has missed out on were an occasional big race due to a flare or a mission trip to a developing country due to the fact that she couldn't get the live vaccine. But most kids miss something at one point or another. Some miss the big game, concert performance, drama production etc due to mono, acl tear, death in the family etc...our kids just miss things sometimes due to Crohn's.
My daughter found her friends and classmates very understanding of her formula diet and even her urgent and frequent trips to the bathroom during a flare. My daughter has even had accidents that her friends were very understanding of. Kids these days are very dialed to differences and accepting. But I understand even if there are accepting our own perception of the situation is different.
I second the suggestion of getting her in with a psychologist who specializes in kids with chronic illnesses. many pediatric GI's have one on staff as part of their practice, along with a registered dietician.