Help meeee, what to dooooo?

i have a friend and we used to be SO CLOSE last year (met her last year).. like we'd littrally talk chat 24/7...then in last years summer she traveled to london and from there shes like "plz call me" and i went like "i cant im so sick my voice is gone" that was my first excuse. then again she asked me to call her and i came up with another excuse FOR SOME REASON TALKING TO HER ON THE PHONE FELT WRONG.. then anyways we went Out (as friends) -.- for the 1st time and it felt so akkwarddd that we planned never to go out again.. but after all that we still chatted for 24/7 like littrally from 6 in the morning till 11 in the morning the next day, i know i made mistakes. alot of mistakes. but i tried fixing them i invited her to my party, i started being SUPER NICE.. i tried with her to go out again but she tottally didnt want that.. :/ and now.. we barely even talk anymore..last time i tried talking to her she was super blunt and her answers were so dead... and its her bday tomorrow.. u know since we dont talk anymore.. should i be like "happy bday"..? or should i just be dry and not talk to her at all?.. :(