I realize this is coming to you a bit late, but I just finally got around to joining and I'm catching up on this forum.
I know what your daughter is going through because it happened to my best friend at FSU. She got dropped from every sorority except for her bottom 3 in round 2 and she was so devastated that she dropped.
She ended up regretting that decision more than she ever thought was possible. She actually got to know those girls outside of the high pressure recruitment process and now loves them. There is one sorority in particular that invited her that day...she now absolutely loves them and is considering going thru spring rush from them next semester.
I wish your daughter would have given them a chance--they could've been the perfect fit. However, I know where she was coming from--it can be absolutely crushing to get rejected from your top choices/favorites, but it's important to go on. Sometimes the place you least expect can end up being the right choice...and can truly become your home.
I encourage her to go through again. If she really wants to be in a sorority for all the right reasons and still wants to be Greek despite this ordeal, she should go through informal rush (if her school has it) or give formal recruitment another shot!
Maybe it hurts right now to see her roomie experiencing something she really wanted for herself but at the same time, it could inspire her to go out and find it--possibly in the homes of the girls that really wanted her. She may not know it yet, but it could be just what she's looking for.