So frustrating for everyone. Well done for holdingt he fort with the iittle ones.
I have a friend with a stoma. The first few weeks were of course a bit trying, as always after major surgery, but she then picked up her life and truly is totally fine. She leads a full active life and has adapted to it all very well indeed - and I guess she is older than your DD, who will have the stamina and resilience of youth on her side as well.
She made me laugh yesterday as the local stoma support nurses have started a group called "Bums on Tums" - a slightly crude title, but understandable!