I had the world's worst work experience girl a few weeks ago. If she came on time, she was completely inappropriately dressed, she was rude, she was lazy... it goes on and on.
And then this morning her school sent me an email asking if I could write a new reference because (and I quote) 'we felt that the original one was not very positive and will not benefit X in the future.'
AIBU to say no? I think giving her the truth will benefit her more in the future than telling her she was wonderful!