Jealousy is a natural human emotion that can be experienced by anyone, regardless of their gender. So yes, it is possible for girls to feel jealous when they see another girl talking to their crush, just as it is for boys to feel the same way in a similar situation. The intensity of jealousy and how it manifests can vary from person to person.
Jealousy can arise from feelings of insecurity, fear of losing someone's affection, or a sense of competition with the other person. It's important to remember that jealousy is a complex emotion and should be acknowledged and managed in a healthy way. Communication and trust are essential in any relationship, and addressing feelings of jealousy openly can help build stronger connections with others. It's normal to have these emotions, but it's crucial to handle them in a constructive manner.