Thanks for your ever sound advice, Gardener.
I feel that I should make an effort to discuss this with my teacher after all, especially since she herself was the pianist for the piece and I would like to thank her again. Also, I've never met the recorder player in person (I don't even have her name), so this might be a good opportunity to communicate my gratitude to her.
Phrasing my criticism of the violin is going to be a tough one, though. Perhaps I should let this one slide, since these are mostly students playing, and since I fear that my teacher might indeed take criticism of her daughter's performance personally (given her own skills as a musician, though, I'd like to believe that she picked up the discrepancy herself).
As for my pride, I think it'll survive. It's just that I don't get a lot of exposure (since I tend to keep my music locked away for projects that never see the light of day), and as I sat there, I really wished the audience could have heard my composition in its original form.
In case you wanted to hear it, here is the original. I intend to fix the velocity on some of the keys for the piano, but otherwise it's pretty much done for now.
Thank you again for your input.