i say u do this.................do what u want to trip or whatever....enjoy urself,,,then go over to her tell her what u have to say...if you start stumbling on your words cos your REALLY high.then just tell her the truth in your case...u wer a bit nervous to confront her,so u did what u did, and now ur mashed,,,but u still wanna talk to her,,and tell her what u have to say..............if she thinks your stupid or wasted...then she aint worth it because u wud have to fake it to get her.....unless shes pro drugs! its might work for u that she respects u for being honest. but repect her if she does think ur wasted, cos its not liek shes lieing.but ur doing u.
try just smokin a little if your nervous. cuz then everything will come out smooth n shit. good luck dude.