u could consider this abuse...shes watching shave ur dick
also.... just forget about her walking in on u j/o-ing
just tell her (about the pubes) that guys have pubic hair, and ur a guy. ur not going to do this with her, cuz u fell uncumfortable, and u dont like shaving ur pubes, cuz (im guessing from my own experiences) that it hurts when i grows back...say ur mom will just have to live with ur body the way it is...then go back to acting normal.
also...try jacking off in the shower, w/ the bathroom door locked. then u can clean up ur lube and all by taking a shower. then ulll also be clean all the time!!!