Girl did weird shit to blow herself out of a sexual state

Met her off tinder.  Tall, sexy, and young.  Met up for drinks.  Hit it off instantly.  We talked, laughed, told stories.  I picked a loveseat and so we were next to each other and touching the whole time.  I used some of MW's patented seated escalation techniques and after the first drink she was leaning into me and giving me googly eyes. 

Got a second drink because its cold af outside and the logistics suck (she's staying with her older sister who was texting the whole time to check on her) 

I finished mine but she didn't finish hers.  Walked to a park because she wasn't ready to go straight to my car yet.  Walked to the park, sat her down, boom! makeout.  She was really into it, started kissing my neck and licking my ear.  I could feel pent-up passion and sexual tension in her kisses and all through her body.  BUT then she started it.  She would randomly word vomit or more like bark out shit about her sister or her dad or her schoolwork.  And I watched her sexual state drop. EVERY time I would ramp it back up she did that. 

Walked her to my car.  Initiated heavier making out.  Took my hand off of her jeans several times calling me a "tease."  Right as I could feel her getting ready to get fucked she started up with the word barking again.  She cooled off so fast it was wild--never seen anything like it before.  

She went from letting me rub her pussy through her jeans and putting my hand into her bra to swatting me away and saying "I'm a good girl and this is the first date."  (No I didn't say anything judgmental about sex or "sluts" or bad girls the whole time).

I've heard about this before but every date I've gone on in recent memory it was either on or it was off.  If we were making out it only stopped when she physically pulled away, never because she did compulsive stuff to lower her own state.

Totally weird, but I've heard about it before.