On the website, Im not that familiar with it, but it seems that you can go on as any name you want. Its not like here where you have to register then log in. So it could be possible for anyone to write stuff under any name which could cause problems.
Though reading through her whole story it does sounds like she just messed up and wanted to fix things by having her mom and friend post.
I'm sure that even if the sororities at Texas Tech decided to give her the benefit of the doubt (never actually typed that out.. guess thats really how you would) they would quickly see through her ways hopefully or see that something did go wrong here.
Who knows.. thats just my take on this whole thing.