I'm so scared and don't know what to do

Lo
My best friend has self harmed in the past and she has never done it again afterwards but she has just told me she did it 3 weeks ago and she can't stop thinking about it. 
She has anxiety and her dad has cancer so that's getting to her but she refuses to tell her mum cause she think she'd get mad at her and I can't tell mine cause she's very disapproving of it and would tell my friends mum anyway. I've no idea what to do?!!😭😭😭 Someone help! 

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