How to refuse a girl's short message confession

It is rare for a girl to do this. She really needs a lot of courage and deserves admiration. But feelings are feelings, and you can't come at all. Don't like them, just don't like them. Nothing you can do can stop it.

Try to write a reply email and see how to write it:

Thank you for looking up to me, but you are not my type. I already have a snow white in my heart. I hope we can still be friends. I wish you find the prince charming who loves you as soon as possible!

I think it's better to be straightforward with such a girl. Maybe she will have some heartache, but she should be able to get through it. If you don't explicitly refuse, I'm afraid she will get deeper and deeper, and it will be harder for you to get out, and eventually both of them will get hurt. There is another message for her to come back later and try not to reply. Even if there is, you should talk less and have a flat tone.