I really doubt the person playing donald did assault her like that. For starters, Donald is a very short character and therefore would most likely be played by a woman. I know it's certainly not impossible for a woman to have sexually assaulted Magolon, but it does make the situation far more unlikely.
Also, as has been stated on these boards many times, cast members find it very hard to see or feel anything through their costumes, maybe "Donald" did touch the woman's chest by accident, not knowing where his hands were. This seems the most likely scenario to me if it did happen.
Finally, if the woman is seriously experiencing nightmares, depression, cold sweats and an inability to perform daily duties just because Donald Duck touched her two years ago she needs to get a grip.
I mean really..... Traumatised?