Hi Purple, you did what you could and helped her get support. You need to look after yourself too, so maybe you needed to leave? Whatever, the past is past, you can still be supportive where you can. Maybe, if you think it appropriate, explain something like you find it hard to see wounds or cuts, so would rather not see it but you're willing to listen, if you feel you can.
Don't beat yourself up, you can only do what you can do, and that is what you did.

Be kind to yourself too, you also deserve it.
❤️