If ultimately she chooses to love others like herself, even if this upset her now, she will ultimately understand and honor your choice. Maybe not today, but in the future. Or she might choose to hold a grudge. Unless you did something evil intentionally, which you didn't, this remains only her personal responsibility. People face a lot worse things than their crush saying "I'm sorry I like you but can't date you" and their eternal life still ultimately depends upon choosing the light. You don't lose salvation, or lose % chance for salvation because other treated you badly (not saying you did).
In fact, and I know this will seem unlikely to you, but believe me, this might be helpful for her. These events when we're reminded of God being out there and to pay attention to Him, ripen in people, sometimes this happens very slowly over the years, she may not even be fully aware until she reaches that boiling point to really seek God and convert. "Being open to try out Christianity" doesn't cut it, sounds sharp but I'm saying because I've been there, this is religious outer practicing of something you don't have inwardly, which is anything but what Christianity is about. I did that as a teenager because I had a few good Christian friends and loved the peace and faith they had. See - all positive influence can't be better - but inwardly I remained agnostic for the time being. There was no faith. It didn't work.
You can't "try out Christianity" it's not like other religions which you can try out. If there is no faith, it cannot stand, this is how people appear to "fall off from faith". They didn't fall off but it's people trying out Christianity for whatever benefit, yet no faith and not actually on board to begin with (born again). You need to want the light as hard as you want to breathe air, then you find it, don't take her words so seriously... God does not come second to anyone, when He becomes the chief need, then He appears and will never not accept such a person. How intense and important is God to you in your life? Yes? Then you understand exactly... All my encounters with Christians before that, either positive or negative, had some role in reminding me of God, God called out to me through them in some way. Seriously, discard these thoughts, you did your best, and embrace hope for the best, God works out all things for good for those who love Him. I wrote this because I wanted you to feel a little better. And here's some coffee. Good morning.
