So disturbing :(

I got a call from my nieces stepmother telling me my niece (13 yo) ate a bottle of pills... she had to take her to the ER for the whole day for her to be monitored, etc. She also told me that suicide/attempts and self harm are “popular” now amongst the teenagers. I have a hard time believing that this is “the cool thing” to do now. Does anyone with a teenage daughter have any insight into this?

Side note; my nieces real mom (my sister) abandoned her own daughter in favor of drugs/alcohol when the daughter was very young. My sister does have mental disorders so it is highly likely that the daughter does have these disorders as well through genetics.