masturbating with the faucet

hey ladies, so one of my friends primarily masturbates with the bathroom faucet letting water flow onto her clit and vagina and orgasms almost everytime. fingering doesn’t do it for her. but sometimes when she does she bleeds for a whole day( a little bit more than spotting) but then it stops after a day. is it because the force of water scratches her vagina. is the effects of douching, or does she have a problem?? does anyone else experience this