Please help! What can I do in this situation with this girl?

I really don't know what to do here. This girl i like found out her boyfriend is cheating on her and wants to end her relationship with him. She told me it on Friday and today she brought it up again and was even more mad, i never seen her like that and everytime i asked her if she wanted to talk about it she got more mad. I literally could not have a conversation with her at all today. Should i just let her "cool down" or is there a way to have her talk about it. SHE was the one who told me she wanted to talk about it then flipped a switch and said no. I never been in this situation before so i'am not too sure.

Please help! What can I do in this situation with this girl?
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