This girl I don't like won't stop talking to me?

theres a girl who told me she likes me and i don't want to sound like a jerk but she talks to me on facebook and texts me all the time and its getting really annoying but i don't want to tell her i dont want to talk to her. i don't care if she wants to talk once in a while but now shes starting to even text me at like 7 in the morning. any ways i can subtly let her know im not interested in her/don't want to talk?