My 14 year old daughter makes up lies and pretends to smoke weed

I'm sorry if this post is so messy and unorganized, but I don't even know where to start. Please bare with me.I have two daughters, 20years old and 14 years old. Long story short, my youngest daughter lies a lot to her friends. My oldest daughter knows her sisters passwords to all her social media, I don't know them and my younger daughter doesn't know that my older daughter knows the passwords.When my younger daughter was in 7th grade, we got a call from the guidance counselor that her friends were telling the GC, that a boy had beat up my daughter. My daughter had no physical marks on her body, and would not tell us anything. The whole situation is very confusing. She would not tell us anything and avoided the conversation. We never really found out what happened. My oldest daughter was able to find out that my daughter made up the whole thing. My younger daughter was "dating" a boy. She made a fake Instagram account pretending to be a boy, and messaged the boy she was dating saying that he was beating up my daughter. My older daughter found these messages months after the "incident" happened. She lied about the whole thing and we never talking about it since. That is one thing that happened that sticks out in my mind.My daughter will continually lie about things on social media to impress her friends and boys. She will lie about silly unimportant things. For example, she broke her pair of beats headphones. She posted about it, which is fine. But then she said that we got her brand new ones and she broke those too. Her friend commented something like "you broke the new ones again!!?" And she said yes. That is not very important but it's just an example of what she does.Today, my older daughter found smoking videos on my younger daughters snapchat. The video shows her smoking a "blunt". Upon further inspection the "blunt" really just looks like a rolled up piece of paper that she lit on fire. She has these videos of her "smoking" the blunt that she sent to all her friends. All the kids in her grade are vaping and my guess is she's trying to be cool. I honestly don't know if she smokes weed. That's another thing that she lies about. In her messages with boys/friends, she talks about smoking weed and talks about buying vape pens and etc.My daughter is very explosive and combative. She suffers from severe anxiety and was just put on medication after trying for years to find a doctor that would accept our insurance. A psychiatrist also mentioned bi polar, but the new doctor said we need to get the anxiety under control before anything else. Along with anxiety she also has a learning disability, and was diagnosed with ADD. I can't ever have a conversation with her or bring this up without her blowing up.I'm not really sure what to do. The "smoking weed" videos seem to be pretty fake, but I assume it's still a big deal that she's faking it. In her messages she is doing it to make people think she's actually smoking weed.What do I do? I'm sorry if I sound so clueless. My older daughter didn't do any of this and my younger daughter is the complete opposite. I'm not sure what I need to be doing. via /r/Parenting http://ift.tt/2wHGZvC