Having second thoughts about my besfriend?

ive been friends with her for about 3 yrs now this year we got more closer though...but shes changed shes not the same all she wants to do now is smoke weed...everytime we hangout she always brings up smoking and its annoying me it seems like now all she wants to do is smoke and that gets really boring cant we just hangout and have some fun without having to get high?! i tell her but she denies it..when we hangout in a group shes always kind of a lameass she wines about being tired and wanting to go home i invited her over to my house and she just sat down didnt even speak just txted and i mean really? she ended up calling a friend of ours to take her home..to me that was messed up..yesterday again me and two other friends ran into her and her lil sis and we walked to s.a to get slushies together and right when we get out the store she walks away and says bye...should i talk with her about this or just drop the friendship..my girlfriend doesnt like her she thinks shes a bad influence on me....i dont want to smoke weed because i dont want to disappoint my mom but idk i feel like i have to in order to hangout with her since thats all she wants to do...