Why is my girlfriend acting so wiered?

Im in my first lesbian relationship. Only problem is she drinks a lot and likes to smoke crack OCCASIONALLY. well she knows my roommate gets pain pills and she wanted to buy some when she got some. Which is maybe tomorrow. But my girl called me YESTERDAY and said "did angie get her pills today /" I said "no" and she said "what the FU*k ever year right..." then I lost the signal on my end and the phone cut out and I don't know what else she said. then I called her right back and got no answer. Then she called me a bit later about 3 times in a row and I finally answered and she said"what are you doing?" I said "o just eating dinner" she said "good for you...who is is this?" I said "Its Jennifer! WTH u called me just now!" she said "o ok I was just checking. By..I love you" and she hung up! And I haven't heard from her since. ???