How do i make it up 2 this girl i like, cuz it was her birthday 2day and stuff?

Okay well there's this girl and we both like each other. The only thing is we don't converse at all and that we don't talk in person. Today was her birthday and i didn't know till it was 2 late and i didn't have the guts or time 2 talk with her. All of my friends that know her were like "Y didn't u talk with her?!!!" and i major screwed up so how do i make this up 2 her, cuz she doesn't answer my calls so i can't do anythnig 2nite so things i can do tomorrow. O have b4 school, recess and after school for her and at our school club....How do i talk with her and make it up 2 her cuz i want her 2 come with me and some of my friends to the movies on friday, so any suggestion on what i should do or say?