I said long ago that I felt Bianca's mother was the Madame, but I don't think the eye colors match up. It could be the one on the left, I suppose. The lipstick color really alters a person's appearance, and if you give her another 20 years with less sun exposure.. maybe. I just can't believe he'd put the hideous Madame in without it having some greater connection somewhere, no matter how bizarre.
To paraphrase Eddie Murphy, "What? I said they dicks was small, not broken." Dawe absolutely could be responsible, along with half the campus, but I'm still not convinced it's actually her. I think it was somebody else's, be it Camila or Ashley, and Arieth saw it in the bathroom and assumed it was hers. Arieth is very much not a bright candle.