[33girl]

Well it depends on a lot of things...

Are they taking her out for some super expensive meal, or just TGIFriday's or the like?

Is it THE WHOLE sorority on one freshman, or a mixed group of people - some freshmen, some guys, some sorority girls?

Does at least one person in the sorority group know the girl before the invite is given from class or dorms or something, or do they come up to the girl out of the blue and say "hey! Go to dinner with us!"

Deferred rush is supposed to encourage normal social interaction and it would be a shame if that was cut out (although as is very clear from a lot of the posts on here, there are MANY campuses and Panhellenics that don't understand that at all), but rush or not, if a bunch of girls I'd never met came up to me and asked me to go to Morton's for dinner, I'd seriously wonder WTF was up with that and probably say no.