I think that she misunderstood when you bought it and thought that it would be shared. Perhaps some of her other friends share them like that or she shares her patterns with them. I think I would explain to her the misunderstanding and then share it with her just this once to save her some embarassment but make it clear that you aren't going to do it again. Then I would have her do the tracing, you paid for the pattern, she should do the work to copy it.