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Why did she change her mood so quickly and was not attracted to me more after we had such a good connection?
She didn't change her mood "quickly". You were in a high energy environment where people drink, laugh, dance and party. You didn't experience something abnormal. You experienced something normal.
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What could i have done better to win her back?
What you could have done better is not put yourself in a position where you have to win her back. That's called prevention. Best cure for a disease is preventing it in the first place. That's general advice.
Regarding clubs, don't take them too seriously. Some things you can't control. And unless you're ready to leave with a girl wrapped around you arm in 15 minutes time, don't stress.
Do it for fun if you wish, but don't have any expectations one hour later, lol.
It's dynamic and fast paced. Strike while the iron is hot or don't at all.