After sitting for awhile the lips of my friends vagina gies to sleep feeling. is this smething she should be concerned with.

Yes , it's not norma: It's abnormal to go numb just like that after sitting. There must be a reason . Something to do with a nerve supply to that area that in sitting position only it's causing hypo sensitivity . Best to be checked by a gyn. Does she have and lower spinal injury. Or may be a mass is putting pressure on a nerve in sitting position.