Self injurious stims

My 17y.o has a stim where she picks her scalp or really digs her nails into it which is now causing bleeding. This has been going on for ages, years but the past few months it has gotten worse. It happens when she is tired, bored, understimulated or relaxed. 

What can I do to replace this? She comes up to me saying, my heads bleeding again. 

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