Those are cut marks from self-harm, and look relatively recent.
Fairly common sight at certain types of hospital. I saw almost identical scars on a girl this week
My thoughts
First, she's likely to be under care, taking drugs both prescribed and non-prescribed and likely to be unstable
Second, if she is willing to carve herself up, what is she prepared to do to you?
Third, unlikely, but I'd be worried whether section 30 of the Sexual Offences Act 2003 could be invoked against you
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