that's ok, Diablo Cody can't write!
She is going to win the best original screenplay Oscar. 
oh, honey.
you're so cute right now. don't ever change.
Uh I am dead serious. She has very little competition for that oscar. She is easily the front runner for it. Who would she lose to? There is no original movie (no coutry, there will be blood are adapations) that even come close to the popularity amongst the hollywood elite that Juno gets.
A good oscar watch site tracks every category and ranks them based on how many awards they have gotten so far:
Screenplay, Original
1. Diablo Cody, “Juno” (NBR**, WDCFCA, CFCA, SA, BFCA, GG*, WFCC, DFWFCA, SFC, AWFJ, PFCS, SDFC, AFCA, TFCA***, FFCC, UFCA***, LVFCS, SLGFC, OFCS, HFCS, KCFC, WGA*, COFC)
2. Tamara Jenkins, “The Savages” (ISA*, LAFCA, SFFC, SFC***, NSFC, WGA*, COFC***)
3. Tony Gilroy, “Michael Clayton” (BFCA*, TFCA***, WGA*)
3. Nancy Oliver, “Lars And The Real Girl” (NBR**, BFCA*, WGA*)
5. Brad Bird, “Ratatouille” (AA*, BSFC)
Juno blows away everything else.