Maybe you could play some "physical" competition typish games, instead of the mental ones??
An example... just out of the blue one night when You can maybe tell that both of you are feeling somewhat frisky... say "Hey, You wanna arm wrestle to see who gets to be on top!?"
Then, the arm wrestling.. you could "let" her win if you want her on top, etc... plus it would bring back a little bit of the old game. Would kind of introduce where you would agree to have her old playful self back... (but stay away from emotional fighting.. to get each others way).
I really think you need to stay away from the alcohol. Don't even TRY to think that she misses how fun you'd be with a few drinks. Don't even go there. Too dangerous. Plus, honestly, that one sentence just screamed out that you want a scapegoat/ reason to pick up at least one drink. Like you are fooling yourself into thinking that you just want one to relax & loosen a little & have some fun. Nope , Nada. Pretend you already had the drink... Act like you would have if you DID have the drink... But.. do NOT use it as an excuse. Please!.
Sorry if I mis-read that sentence, but it just seemed to say so much more underneath the words than what you actually said. Hope I mis-interpreted it!
But... otherwise, go ahead & have some physical fun, trying to pull out some competition within her.