Its okay if she acts like nothing happened, some girls do that. I have a fwb who I see once or twice a week, and she does something similar. She is so affectionate when we are in bed and afterwards, you would think she is going to ask me to marry her(metaphorically speaking ofc), and then acting a tad distant at first when I see her the next time. You cant expect them to want to jump in you every time they see you.
I actually enjoy the situation with my fwb, because it always starts with her acting as if nothing had happened between us last time, and ends with her trying to kiss me and getting turned on, while I am acting all playful and teasing her, and doing stuff like leaning in close to kiss her than taking my head back right when she goes for the kiss... I actually enjoy the situation a lot, because its like a challenge for me to ALMOST pick her up again next time I see her

. The trick is that I make plans to go to really cool places and do a lot of awesome outdoor activities and shit like that, and she loves every bit of it. I basically dont let any of her initial distance taking get under my skin, and try to lead her through awesome experiences that I myself want to see, essentially enabling her to experience my reality.
The point I am making is, dont overthink, dont let it affect you emotionally, enjoy the process of hanging out with her dont be too outcome attached, that will hinder you presence and make you a bit stuck in your head and emotionally vulnerable. And dont limit yourself to her, as long as she is not exclusive, dont limit yourself to being exclusive with her. Keep her as one of the options, the top option if you want, but still an option. Dont start treating her as a girlfriend yet. I hope this helps.