User blog comment:SeddieKissiOMG/Possible reasons why it could've been Melanie in iOMG/@comment-3517755-20110415192148/@comment-1874176-20110415193943

And I doubt that Melanie could come home from her boarding school that quickly (and miss class for the time she has to fill in for Sam); there'd have to be a week between those two scenes at last, and it's only been a few days.

And Carly also said "smells like Sam". That aside, Carly knows Sam WAY too well to be fooled into confusing the Puckett twins.