Good for your daughter! More importantly, good for you, as a mom, in properly guiding her. My daughter is now 26 and has formed her own opinions; however, the faith foundation laid when she was young, has become her resource :-)
Here is another, excellent resource for both of you. It comes from The National Organization for Marriage. SAME-SEX MARRIAGE: Answering the Toughest Questions
Both of these are very valuable. NOM is good and Bill May is excellent.
Link doesn’t work.