Unfortunately, it wouldn't matter if she went through rush or not, she's got those moldy stereotypes and pre-conceived notions in her head, and with people like that, there's almost nothing you can do.
Personally, I believe society as a whole (particularly the likes of Ms. Ebaugh) is way more close-minded and judgemental than any sorority memebers I've met. Personally, yes, I will celebrate when and if I or any of my sisters get engaged and married. I'll also celebrate when any of them get pregnate, get their first "real" job, get a promotion, win a Pulitzer, get new shoes, or finds a quarter on the sidewalk - it doesn't matter, the point is we're supporting each other, and getting joy from others good fortune, and sharing a cry with some of the bad stuff. We're they're for each other.
Plus, just because I'm a 'liberated' women of the twenty-first century, who says I can't still find happiness with a caring man (or woman for that matter). Finding a person who loves you and supports you, and you feel the same for them, is one of the most rewarding relationships you can have (hello - my parents are a perfect example). Okay, huge tangent, but anyways...
I'm sure she just picked those two things because they reinforced her opinion. "Selective" journalism at its best