Really feel for you, hope mother will get the message. I agreed to let a young girl part share my ploddy cob, mother told me what a good rider she was. In fact, when I saw her ride she could barely do rising trot. I let it go for the months trial we had agreed then tactfully told mum I didnt think it was working out, mum went off in a strop shouting well he's a real dobbin anyway. Just as well he was as child would not have managed anything with more spirit!