You can try asking why, or you can communicate in other ways. Generally speaking, women are more sensitive and curious about the opposite sex than men, and then they don't contact you. This may indicate that her intuition thinks that you may be inappropriate, but sometimes her intuition is not accurate. Let me give you a suggestion. If you want to associate with her, you might as well take the initiative and get into the topic slowly. It will be fine after a long time. Start with friends, maybe you can find unexpected interesting things by chatting. Good luck.