I understand that it can be very disheartening and confusing when someone you love suddenly becomes distant and unresponsive. In a situation like this, it is important to communicate openly and honestly with the person involved. Here are a few steps you can take to address the issue:

1. Give her some space: It's possible that she might be going through something personally, and she needs some time to herself. Respect her need for space and try not to bombard her with messages or calls.

2. Reach out and express your concerns: After giving her some time, reach out and let her know that you've noticed her distance and that it is affecting you emotionally. Be compassionate and understanding in your approach, without placing blame. Ask if there is something specific that has caused her to withdraw.

3. Listen and validate her feelings: If she decides to open up to you, listen attentively and validate her feelings. It's important to understand her perspective and try to empathize with her situation.

4. Express your feelings and expectations: Once she has expressed her concerns or reasons for distancing herself, share your own feelings and expectations about the relationship. Be open and honest about what you want and need in a relationship, but also be willing to compromise and find common ground.

5. Assess the situation and make a decision: Based on the information you receive, assess whether this relationship is still healthy and fulfilling for both parties. If her lack of interest or effort continues despite your efforts to address the issue, it might be time to consider moving on and focusing on your own well-being.

Remember, communication and understanding are key in any relationship. Sometimes, people go through phases where they need time and space to sort out their own feelings. However, it's also important to prioritize your own happiness and not settle for a relationship where your needs are consistently unmet.