DD has literally bitten her fingernails down to the nail bed, they regularly bleed and are raw looking :( she has also in the past couple of months began licking things - started by licking a mirror in a changing room and its getting worse. She licks trolleys, my coat, my skin, her skin, windows etc. She also occasionally spits for no reason - only today I have realised the spitting is probably sensory too. I am wondering if chew toys may help this? Or any other suggestions very welcomed!