Worried About Our 19 Year Old Daughter

Our daughter recently started dating a boy that LOOKED like he was a "stoner" for lack of no other word. Long story short, she pulled some antics and my husband and I sent her on her merry way to "play house" with this boy. (We have gone through this repeated crap of her taking off and not coming home so this time we called her bluff) Anyway, she stupidly told one of her friends that she was screwed up on Xanax. The friend told me about it. Her sister went over to visit, only to find the boyfriend putting these white and blue pills out on the table, crushing them with a credit card, and snorting them through a 50.00 bill. Can one ingest Xanax through the nose? What would these blue pills have been? I am so sick, however, the b/f kicked her out 2 weeks later. She seems fine, but terribly depressed. I'm so afraid she may have had a taste of something she liked and will go out seeking it. She does smoke pot, much to our chagrin. She is also on an anti-depressant "lexapro."
Thank you for any help or suggestions..
sleepless here in Ohio
The blue ones could be Xanax..what shape are they formed?
I'm not sure what shape the blue pill was in. Would someone ingest this through a straw/dollar bill?
Sure can..