send a happy new year text (at new year, obviously!), see what you get back. If you do get to see her again, apologise for coming on too strong, just explain that you've always fancied her and had been over-optimistic that she fancied the pants off you! Lighten the situation, laugh with her.
You both had a few drinks? It's none to surprising what alcohol can do. Maybe her relationship isn't going to well, she needed a shoulder to cry on. Maybe she said that to test the water, because she likes you too?
Roses, necklaces, finding out addresses.....woman liked to be spoilt, but the smell of desperation is off-putting. Try being yourself, I'm sure that'd be the winner