She shouldn't have had that done to her, but why on earth would you bring religion and then insult someone's religion in an argument? That's just low.
FYI, the whole thing about Christians being unclean is complete nonsense. Clearly they aren't educated enough to realise this is (for obvious reasons) false.
As above, context. Doesn't excuse what they did (or what she did either, clearly that's not going to help) but it seems like the reaction would make more sense if you lived there.