Ok i've been thinking about making this post for a while, but eh i'ma do it now.
Now i don't have Pua Guru level game but i believe i'm pretty good and i've found a little way to boost the girl's state. Anytime convo goes dead or the SPAM in the area is very dead i'll play a game with the girl. The game? Rock, Paper, Scissors
Rock Paper Scissors? Yea this game seems childish, immature and playful which is exactly why it boost state. I normally begin by using paper a couple times untill she catches on and uses scissors, then I'll tease her by saying she's cheating or a mind reader. After she wins a couple times and start's smiling and having a small bit of fun, i'll change it up. Then we'll just play around for a while make sure you keep your hand out when you lose or when you win so the interaction will occur (hand of paper over rock, rock smashing scissors, and scissors cuttin up paper).
You can also make some ante's as if you win a couple of times she gives you a hug or kiss on the cheek and vice versa i would recommend doing this after a couple games (rock paper scisssors goes by fast) also if you've already gamed her good enough. Just keeping the game fresh also don't depend on the game it's just something to kill a lil time, maybe if the girl likes games she'll change it up (happened a couple times) or maybe you'll change it up, whatever.
Anyway this is one of my personal trumps it may work for you may not idk plus i'm a highschooler but that doesn't mean older girls don't have a lil kid in them. Another thing if she's older by a good bit she might not know what rock paper scissors is, so.... whatever have fun sarging