Rosy, I don't know where you are, but I am in zone 9, and my moonflower is twice the size of yours and I don't think it will bloom before frost. I was late planting it this year, and we had real hot, dry days, so it suffered. I would say, no, I don't think it will bloom. I don't think you can overwinter the vine-I think another would have to be started from seed.
zone 9 Southwest La.