I'll be honest, if Donut goes out with Ice I'll think less of her for it. She may be naïve about relationships, but doing so would give the impression she just goes lwith whoever pays attention to her and has little in the loyalty or commitment departments.
Think about it. She's in a very upset and confused state of mind. I'm not saying it would be okay for her to do it, because it wouldn't. However, I would somewhat understand why. Just a little. 1) She believes that her relationship won't last long, 2) She believes that Mew and Ploy kissed, 3) She's upset that found out about the study abroad thing when and how she did, 4) She feels she is all alone and has no one, and 5) Ice, a long time and supportive friend, just confessed to her on top of all of that. If she ends up accepting it I wouldn't be too surprised. Also, I wouldn't be against it.