I know the default answer is to "accept" the daughter's position on being gay as loving parents, but is it okay to discuss it and maybe show the daughter that she's actually not gay after all? Or will that be perceived as, "My parents don't love and accept me for being gay."? She might have friends who push that stance about the parents, which could cause harmful division between parents and daughter. Maybe she just saw some things on social media about it and declared it without truly understanding it or thinking it through. How should parents respond to a young teen if this comes up, especially knowing that other kids are egging her on and celebrating her newly-declared stance?
Hello! I'm not a parent but whatever way you can deal with it, you should definitely talk to her about it. Ask God to help you with it.
As a parent, God has given you the responsibility to bring up your child in the knowledge of God. She might just have been exposed to something as you said and you could do something about it while it's still early.
Proverbs 23:13-14 KJV
Withhold not correction from the child: for if thou beatest him with the rod, he shall not die. [14] Thou shalt beat him with the rod, and shalt deliver his soul from hell.
Proverbs 20:11 KJV
Even a child is known by his doings, whether his work be pure, and whether it be right.
Proverbs 22:15 ESV
Folly is bound up in the heart of a child, but the rod of discipline drives it far from him.