Can they be helped? I don't mean any disrespect, but you have to wonder. I mean they'll get over it eventually. I don't know if they'll be friends but I'm still not quite sure I understand what's going on at all.
I only met Donna once, and she was.. lost. In the library. And why are you doing this and not him? He's here, isn't he?
It might be best, if you don't want them to fight.