eating disorder

Hi so I just recently found out my good friend has an eating disorder. She admitted to me she's been taking laxatives every day multiple times a day. I was just wondering if anyone has experience with that personally or if they know someone who has. I wanted to know how bad it is for you and what I should do to help her out. She never told me if it worked or not but basically just said it's turned into an addiction, she feels gross when she doesn't have them. Just worried but don't know what I'm dealing with. Thank you ❤️