ARE PISCES GIRLS JUST TOTAL FLIRTS?

I Have known this pisces girl since the beginning of high school and she dated my longtime friend all the way through high school. Kinda sucked because I wanted to get to know her better and she was so sweet and beautiful, such a kind and innocent girl, he was crappy bf he would always talk about the girls he was hooking up with and it just pissed me off he is a SAGG btw and I would have never hurt her. Anyways, bout a year or so ago they broke up and I went to my friends party and she was their, but I was passing out and calling it a night and she came into my friends room and started teasing me and trying to hit me to wake me up and I grabbed her arm before she could do it and I just stared her down and we both smiled at each other it was a weird moment. She ended up leaving and I followed her back into the party. I just hung around and kept my eyes on her, not like full on staring just a few long glances and she caught me and just stared right back and she never look away and just smiled and we chatted for a lil bit and she ended up leaving and i got her number.

I texted her the next day and she never replied, so i just said to myself it was a one time thing and she meant nothing by it.So i just forgot her and looked elsewhere. Her birthday came along and this is two months since i texted her. She was having a party and I decided to go, I declined the invitation to even go. Well when I got ttheir she was still getting the party ready and she was mixing drinks and I didn't say a word to her when I walked in and when she was walking back and forth to the sink for more water she walked by me and said hey! and slapped in the back of the head...idk why she had to slap me in the head. Then she walked by me again and punched me in the arm twice and I started talk to her a lil more and she joked and teased each other. I told her she did a great job with getting the party setup and she asked me if she should add something to the drink and I said yea sure idc. lol Really i didnt, but she insisted on wanting my opinion. My friend asked " why does it matter what he saids?". She said " I do anything he saids" I didnt know if it was a joke or not, i kinda of chuckled and just took it as a joke. She wasn't laughing though lol...She has me so confused and Im overthinking all of this, but she has never acted like this around me before its so odd and we aren't close enough that she should be doing this. I'm a Capricorn btw, so i dont really initiate much when it comes to girls, because i never know if they are just flirting for fun or they are for real i stay calm and take my time with it. Patient is key. PLZ HELP