I think validating her is a good support as well. We all know too well how crazy it can make us NOT being validated.
"I hear you and understand you are concerned."
"You are smart, intuitive, and I hope you trust your gut."
I don't know if anything like that would have made a difference in MY actions in the beginning because I was pretty great about lying to myself and others about any problems I had...but now, and the healthier I get, THOSE are the words I appreciate from my friends.