Personal grooming

Tonight at church a girl sat beside me during the service... I know her but I hadn't sat beside her before. I like her well enough but I have to say that by the end of the service I was ready to kill her! She spent the entire service (and especially during the sermon) biting her nails, picking at a mostly-healed scab on her knee, picking at bits of skin on her arm, fidgeting and cracking her knuckles. It was HUGELY distracting. Why can't people take care of their personal grooming in the privacy of their own home???