Well it wasn't a total failure, you found a good stop, even if you didn't get the turn you were looking for.
I am also thinking it didn't hurt her, remember when you are asking advice on an open forum a number of things are true
Lots of people will try and help - Some are only here to make trouble
Some people will have experience with the issue or equipment you are asking about - some will have never dealt with it, or used the equipment in question.
Some will be experienced in the discipline you are talking about - some will have experience in other disciplines.
NOT ONE of them have seen this horse, or your daughter, so at the moment the collective wisdom is just a series of opinions with not a lot to back them up
Remember you came to ask how to put the bridle together, not to defend your trainers choice of bit, if you have faith in her, do not let this sway you, follow the lead of the person who is there on the ground.
Maybe if you post videos, then the right people will pop up and give you some sound advice, the trick as ever is working out which is the sound advice!