It's difficult to determine someone's intentions or motivations without more context or information about the situation. There could be various reasons why she keeps "checking you out" even after rejecting you. Here are some possibilities:
Curiosity: She might be curious about your life or how you're doing after the rejection. People often want to see how others react to rejection and what changes may occur in their lives.
Regret: Sometimes, after rejecting someone, the person doing the rejecting might feel a sense of regret or wonder if they made the right decision. This could lead to them checking you out to see if they still have feelings or if they miss the connection.
Attraction: Even though she rejected you initially, she might still find you physically attractive or be intrigued by certain qualities you possess.
Habitual Behavior: It's possible that she's not consciously checking you out but engaging in habitual glances or gestures without specific intent.
Unresolved Feelings: She may have mixed feelings about the rejection and might be trying to understand her emotions better.
Coincidence: Sometimes, it may appear that someone is checking you out, but it could be coincidental or misinterpreted body language.
It's important not to jump to conclusions or make assumptions based solely on her behavior. If you are interested in finding out more about her intentions or if you still have feelings for her, consider having an open and honest conversation. However, also be prepared for the possibility that she may not be interested in pursuing a romantic relationship and respect her decision if that's the case.
Ultimately, everyone's actions and emotions are complex and unique, so the best approach is to communicate openly and respect each other's boundaries and feelings.