Dont feel bad or guilty. You've done an amazing thing.
Now, if she wants to get completely wasted, she can do it with weed and be safe. If she did it with alcohol she could easily die.
You could have introduced her to something that may one day save her life.
And no one here can disagree with me.
And also cannabis smokers are significantly less likely to become depressed, even though its classed as a depresant.