my daughter has managed to day to get on her but what a struggle!
She then wasnt too bad until she tried to trot her then she tried buckin etc to get her off! Then carried on walking fine??
Everytime she tried t get on and off tho she really tried
First off, stop trying to get on her & don't ride her when something is obviously so wrong - of course the horse will be trying hard to get rid of the pain! Your daughter doesn't want to become more associated to that pain in the horse's head. Especially in the early days of the relationship I'd be really striving to ensure I and my 'games' are Good Things to the horse, not Bad.
Find & fix the issue before attempting to ride again - tho you could see how she goes bareback - perhaps it's purely the saddle. Again, I think the problem is very likely pain, so forget 'working with' her until that's resolved/ruled out first.