I taught high school from 2002-2008, and I can tell you, schools are brainwashing our youth to believe that homosexuality is okay, and that a woman’s right to choose is the right choice.
I am sure I could have gotten in trouble, but I would debate with students if I overheard them talking about these issues.
What I have found is that both sides use emotion to win support.
Abortion supporters cite the examples of rape, or incest as reasons for abortions. These situations are troublesome, but they account for but a fraction of the abortions done. Explain (and show, look online for pictures of babies in the womb, info on the heartbeat at 3 weeks) that scientifically at the moment of conception a person is developing. So why should the mother have the right to chose but the baby not? Is the convenience of not carrying baby for 9 months worth murdering over? I am sure you can explain all this in a way that will help her understand.
Homosexual supporters will say that they have no choice, they are born this way. They will say it is genetic. They will use “If two people love each other, and they are consenting, then who are we to prevent them?” Explain that while it is difficult to tell two people whom love each other that they can’t, it is what must be done because it is right. You may want to use a non-religious approach as she is probably hearing at school people say “separation of church and state”.
So here is what I say. Man and woman are naturally meant for each other. Not only do their parts “fit” but that action results in the natural procreation of our species. Homosexual sex has always been view in all of history as something wrong. Ask her why that could be? To really get the point across that simply because 2 people chose to do something, does not mean we should let you can talk to her about polygamy or incest. Our government does not allow these situations to result in a marriage.
If you think the religious approach will work, then I would suggest the book in my signature. I recently read it, and it completely changed my view of sex and marriage. There is one chapter at the end on homosexuality, but you really should read the entire book, as things will make sense, plus you pretty much know why homosexuality is wrong by the time you get there. Seriously, buy that book, everyone.