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?
Pray to dissolve these desires of your daughter, pray for her wisdom.
Kids are just foolish and do foolish things. A 13 year-old does not understand what life is about, you must explain it to her. God tells us in His word.
Simplify it.
We were created male and female for a purpose - Adam and Eve, not Adam and Steve. God intended for all of us to have a mate of the opposite sex. Only few were made to be eunuchs.
We are all sinners. God's Ten Commandments gives us a basic idea of what sin is, when we violate them.
"Honor your parents" is one of them. Obey them, they guide you, help you not to stumbled and fall into habitual sin that leads to darkness. Read through Romans 1 line by line.
We all have inclinations, desires, impulsive and powerful as they may be, we must learn to control them.
Food, drink, anger, words, lusts, our actions, etc., are things we need to learn how to control. Just because we like a person, enjoy being with them, talking to them, more than anyone, doesn't mean we should have sex with them. There are boundaries, rules in life. We are not to have sex with our parents, siblings, aunts, uncles, cousins ... nor those of the same sex.
People have fits of anger towards someone which might lead to thoughts of killing them. But they must control their actions, stop and dismiss those thoughts because they are dangerous. So we need to dismiss lusts of sexual desires in the same way. Control ourselves. If not we descend into a dark place where the longer you remain, the more difficult it is to get out of.
There are consequences to sin. Some are temporary but some can ruin your life. God chastises those He loves, as we should chastise our children if they disobey and rebel, in a loving way. Tough love they call it.
Control your thoughts emotions and actions!