Don't know what to tell you except YES, we women do use shaving cream and though I prefer a woman's scented one, I have purchased and used men's. Mostly my h's b/c it's cheap and works. If it was on her BATH tub, ignore it. Really. You SO have weirder things to figure out.
Good luck, I'm lurking but waiting for a brilliant insight and until I have one, I'm just lurking some more. j-
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016