You can determine if a girl dislikes you by observing her body language and actions. If she frequently avoids eye contact, crosses her arms, or turns her body away from you, it may indicate disinterest or dislike. Pay attention to her tone of voice and responses. If she responds with short, curt, or dismissive answers, it could be a sign of dislike. Lack of engagement in conversation or avoidance of spending time with you may also imply disinterest. Furthermore, if she consistently cancels plans or makes excuses to avoid seeing you, it could signal her dislike. Remember to trust your intuition and consider the overall context of your interactions, as these signs can vary depending on individual circumstances.