Okay, I looked it up, the JY 15 looks like a nice lively boat:
Google Image Result for http://www.thesailingclub.us/images/Boats/JY15%20full.jpg
So, it's weight-sensitive. if you hike out on a broad reach and heel her to windward, you will acquire lee helm (she will want to steer herself to leeward and toward a jibe), which is undesirable. So don't hike as much if that's your situation.
I'm not sure what you mean when you say the wind "turned" it. You mean heeled you over? Or turned your bow downwind ("lee helm") or upwind ("weather helm")?
If you are just over-heeling to leeward, then you have too much mainsail up. Can't fix it since no reefing points (and I saw none in the photo)? Just ease main out more and earlier, and hike like hell, no other choice.
If you have lee helm, skip the jib. If you have too much weather helm, don't skip the jib, but invite a friend to hike out with you. Or, do what Letrappes (who *has* sailed them) says, and stay ashore til you get more moderate wind.
Correct me if I've failed to grasp what you're asking.