I said I wasn't going to have her in my post
She is on working livery at the RS (but only used by the owner and son) so I would have thought they may have said something, but TBH they have a 'that'll do' attitude rather than 'it has to be right'.
I don't know how to tell her without making it sound like she is a bad owner
Your description, nappy, ex racehorse, rears, working livery and novice rider fills me with horror.
I have met several people who would happily give these away.
Despite what people think because a horse has raced it does not mean it is ready to be ridden in a conventional saddle. Young flatrace horse's sole education may be having a very lightweight rider put on to go to the races and possibly follow others to the gallops in a string. These are intellegent horses but they need to be taught to go forwards on their own, to know what riders mean by leg and hand aids.
Walk away from both the horse and any RS that thinks this is a suitable horse to have as a working livery. Very old saying 'green on green equals black and blue'