How do I tell my roommate about her fishy odor?

Redstrawberries28
Okay my roommate is cool and a nice person. We share a dorm room with a bathroom by the way. I noticed since September that whenever she comes on her period the room starts to smell fishy. I went in the bathroom behind her and it smelled like fish. I want to tell her but I don't want to sound like I'm being mean but I don't want to live in a fishy smelly room either. she's a nice person. She just has a fishy odor only when she's on her period. How do I tell her without being to harsh? Its actually harder than you think.
How do I tell my roommate about her fishy odor?
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