Why would a girl that rejected dating me still try to engage with me?

Just a bit of background. I was dating a girl and we went out four times. All went well but she had just broken up from long term relationship. I asked her if she wanted to continue dating she declined. I handled the rejection graciously and wished her luck. I do see her a few times a week at the gym which is somewhat unavoidable it's where we met.

I am trying to keep out of her way but not ignoring her. When I was on the treadmill minding my own business today she came right up to the side and started stretching about a foot away from me. There was tons of other available spaces to stretch all well away from me

When she rejected me I wished her well. I don't understand why she would feel the need to be so in my face unnecessarily when she quite clearly stated she didn't want to continue dating. It doesn't feel like a particularly nice thing to do if I'm trying to move on. She has never behaved in disrespectful manner to me before so I just don't understand her logic of trying to be close to me in circumstances

Why would a girl that rejected dating me still try to engage with me?
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