What are the pills that my sister is taken, and should I get her help?

im 13 years old...I have a 19 year old sister and she has been acting different..im starting to think it drugs or something..i don't do drugs and i don't know much about them? so i would like for anyone to tell me about the stuff she is doing..well she is home for christmas break..her and her friends will lock themselves in her room and do stuff...I do know she smoke weed..that is not what im worried about because weed comes from the earth. But i found pills..Lori tabs and Bars? Plz tell me what these are. I over heard her on the phone ask her friends about bars?? what the hell is a bar? And what are loritabs? I want to spend alot of time with my sister but she and those girls are always together taken these pills.everyday plus they smoke weed...So she is usually she is pretty fryed most of the day..With the pills she seems tired all the time when she is on them, and she will fall asleep and when i catch her i will ask her why she is so tired, but she said she isn't tired? I just don't know what she is on, and its scaring me...the other day i saw her take 2 of these "bars" and 2 loritabs? what do these pills do to you? Also I her one of her friends ask her has she ever "jigged" before...and they talked about having alot of water and my sister sayed she wants to try "skittles" cause she wants to "jig" I know skittles aren't candy...And what is "jig"