What do you do about persistent interestees?

A soror of mine from another school complains about how this group of interested girls keep doing things for them and buying stuff in order to get my sorors to like them. She is worried that these girls will get them in trouble for making it appear as though they are pledging. She has complained to her advisor and they have even told the girls to stop. But one of the girls has been rejected twice and will graduate next May, so it is her last chance to pledge undergrad. She has stated that if she doesn't make that line, then the line won't cross. Those are some big words. How do you, as in those in BGLOs, think this situation should be handled. I know what they are doing to handle it, but I am interested in knowing how others, in BGLOs, would handle this situation.