Well for starters you’re doing the right thing caring for your friend especially if she is addicted to cocaine as it’s a class A and highly addictive that’s why I’m never touching it myself personally and your friend might not be aware that she’s addicted and especially if she says she thinks she took too much and feels like she’s dying that’s a sign that she may either want help but doesn’t wanna admit or ask or she may just be really enjoying herself but not realising the health benefits, I would defiantly talk to her about it explain that you’re worried and that she may somewhat be addicted which she then may be in denial there’s only so much you can do to help someone if she chooses to ignore you and carry on then let her be she will realise in the end that cocain isnt worth it but if she does listen to you then she’s going to need a lot of help and support to help her try and stop! Sorry this is long too read