Here are some suggestions:
1. Communicate with your daughter: find a suitable time and place to communicate frankly with your daughter. Understand why she chose to use prosthetic genitalia and how she felt in the process. This is a very personal topic, so try to be respectful and empathetic.
2. Provide support: Tell your daughter that you will always support her no matter what decision she makes. Adolescence is a period full of challenges and changes, and children may be confused about their identity and body. As a parent, your support and concern are very important to her.
3. Seek professional help: If you feel that you can't cope with this problem, you can seek the help of a counselor or a doctor. They can provide you with professional advice and guidance to help you better understand and support your daughter.
4. Educate yourself: Learn more about adolescence, gender identity and sexual health, which will help you better understand your daughter's situation. You can read relevant books, articles or attend lectures to improve your understanding.
5. Protect your daughter's privacy: Respect your daughter's privacy and don't share this information with others without her consent. This will help to maintain her self-esteem and self-confidence.
Finally, every child is a unique individual, and their growth process will be different. As a parent, you need to give your children enough care and support to help them through this challenging period.