she's 25 years old.
First of all, welcome here.
Thank you for your welcome and your words of advice.
My fiance is going through the very same thing with his 36 year old addict son.
"OMG, I got engaged, the world will never be the same!...."
She is only furious with you because she can not come across as the "good girl" anymore and you know her secrets..you didn't do anything wrong...you were reading texts in a phone that she left there...and you had an obvious concern for her well being.