SILENT TREATMENT..

Okay, so when someone gives you the silent treatment what do you do when you have no clue why there ignoring you?? I am finding myself in this situation right now with my roommate. I know her and her boyfriend just broke up and I tried talking to her about it (this is the last time we talked) and she just wrote me off. She said she was fine and I gave her a hug and let her know that I'm here for her when she wants to talk about it. After that i gave her, her space so she could think about things i didnt want to bombard her with questions. It has been 5 days now and we haven’t spoke once. This is very irritating, morally because I live with her. She did talk to one of my friends about it, saying that I wasn’t there for her when she needed me, witch is untrue I let her know that I was here for her when ever she needed me. I know I should pull her aside and ask what the problem is but she's not very nice when she doesn’t like someone, and she will tell you to your face that she is vindictive. I cant decide if I should just go along with the way she treating me and count my loses. I guess she's not that great of a friend if she's going to treat me this way. I think its childish, mind you she's 26. I am really lost with this whole situation.