I don't know how you are but if you wanna mess around lmkkkk?

So I met this girl online and the conversation turned out great. We started to get to know each other for about a week and the interest seemed mutual to start. She was always attentive with conversation and tried to keep it going. Asking how I was doing and seemed concerned with what I did next and always asking what I’m doing. As a nurse it felt good because she would ask how my patients are and how work has been turning out. On the other hand she would have clinicals for athletic training and would greet me early in the morning and would apologize if she got too busy. All in all through conversation she was interested and consideration and eager to know more. I noticed she didn’t really validate me too much and as a man that isn’t really important to me but I bring it up for this reason. This morning while I was at work she did a complete 180 and said this through text in the screenshot below when I asked about our plans for the weekend where we would be free. Is this a test of some sort. Why would go through a whole week of getting to know me for something she could’ve flirted and got out of me in a day. I’m not complaining but I’m just confused as to what this meant. Any thoughts?
I dont know how you are but if you wanna mess around lmkkkk?
I dont know how you are but if you wanna mess around lmkkkk?
I don't know how you are but if you wanna mess around lmkkkk?
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