Holding Rush Events and Getting worried

[rush chair 01]

Hey GC'ers!
So I'm the Recruitment Chairman for my local sorority. We're halfway through our Spring Rush Week and our numbers are dwindling, which has me concerned. My sorority normally bids 4-7 girls in the Spring semester, but at our event last night we only had three pnms. If we do not get more than four new members, it is an option that we may hold additional events to try to get some extra new members, but my sorority has never done this before. I'm concerned that the issue we are having revolves primarily around some of my sisters and their not-so-tactful way of talking to pnms. I've held a workshop to try to work through these problems, tried talking to these girls individually, and even worked stuff out so that they would be around the pnms less, but I feel they are having a negative effect either way. Is there any advice anyone has that I may be able to try next?

Also, does anyone have any advice as to what I could plan on doing for additional events on a limited budget if I have to plan additional events to get more girls out to check us out? I've come on here before to look for ideas, used the search engine, and actually have a different user name on here, but didn't want to use it and potentially give away my sorority. I just need some fresh ideas and tactics for finding new sisters. Having a good Rush this semester is VITAL for my sorority, and I'm really trying to do anything and everything within my power to make that happen and I would greatly appreciate any advice anyone has.
Thanks!