AndTylerToo

Hey everyone, I have arrived at a very strange and hurtful situation for me. I recently got the idea for a joke to play on my friend, and other people tagged along and it got more out of hand than I had in mind. After this she was very angry with me and didn't talk to me for about a week. I decided to give her her space and let her calm down. After the week passed, she still was ignoring me, acting like I wasn't there, etc. I 'confronted' her in a very non-hostile way, asking why she was still mad at me, and also only at me. She is kinda high strung and told me that she was mad at me because I, of all people, should have known her and know that she wouldn't find it funny (I realized that the out of hand version wouldn't be funny, but again, not what I intended), and I understand that.
But heres the hard part. She said that her life is too stressful right now and that she needs "infinite space" from me. She is/was (hurts to think that) one of my BEST FRIENDS. She essentially told me to fuck off... Of course for the time being, I am going to leave her alone, so, if she still is mad, that she can sufficiently calm down. However, it is very scary to me to think that she might never be my friend again. Basically I'm wondering how to proceed, and your opinions - which I know won't be too accurate considering you don't know her - on the matter. Thanks for all replies and help.

Edit: I just realized that I didn't say what I had done. In my astronomy class, we had a lab involving lenses, and at the end, it involved focusing the light to a point so that we could burn through paper. I intended to burn a little dot in a corner of her planner, but when the other people tagged along, a considerable portion of one of the pages was scorched, and some of the burns were deeper, going through several pages. I was also considering, at the very least replacing her planner exactly, so that it'd show that I was sorry, that I wanted to make a mense, and also so that she wouldn't be hurt/angry whenever she saw her planner.