Logical according to some people but not to everyone. It wasn't her toilet or bathroom and this was a share accommodation house. Why not let Filomena or Laura deal with it since the 5 euro fine for not cleaning was their idea. It was their problem not hers.
I'm quoting this again because I'd not heard about the house fines. I'm waiting for MichaelSmith to post his link but have others heard that the animosity had risen to this level?