My own chapter, after thriving for a long time, suddenly wasn't doing well at all during recruitment. It wasn't an out of the blue thing, but over time, it had dropped off. When they got down to 18 women, concern really kicked in. Then we found this amazing group of women - 30 to be exact - who had gone to Greek Life and asked for them to open the campus for extension because they wanted to bring a new NPC group in. Campus, because we already had too many sororities, said no. So we went and found those women, and after a mini recruitment and interviews and such, we invited the entire group to join.
The active sisters in the chapter were not part of the interviews. Once the mini recruitment events were over, the chapter was notified that IHQ would be interviewing the women and making selections. The active sisters were allowed to become alumnae member if they didn't want to take part in the rebuild. It for sure saved our chapter.
My advice is don't be afraid to ask for help and ask for it often. Your IHQ is there to HELP YOU! Also, make friends with your campus Greek Life office. No Greek Life personnel want to lose a chapter from their campus. Also, find a chapter advisor if you don't have one, or if you have an old alum of YOUR OWN chapter as an advisor, talk to your IHQ about finding another advisor to work with your current advisor from a more successful school.
Best of luck to you