What do I do about my friend?

My friend has an eating disorder and i don’t know what i can do to help. She is aware she has a bad eating disorder that she goes into spirals and according to her i triggered one i don’t know how i did since i do try to avoid trying to say anything in that matter. Which brings me back to the fact i don’t know what to do to help and not trigger anything im drowning in anxiety because when she texts me causally about her spirals which are obviously not casual I have nothing to say and don’t know how to respond because i don’t know what to say to make it better or at least not worse.

What do I do about my friend?
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