Hi Jesper,
Wanting her is understandable.
However, she clearly showed at the school party that she doesn’t want you in the same way.
Regardless of how much she looked at you after having rejected you, she still made it clear that she wasn’t interested in you by rejecting you in the first place.
Again, you should only send a snap to her if you are truly intent on being her platonic friend.
If you send her a snap in the hopes that you can somehow get her to like you, you may find yourself repeatedly getting rejected.