When I'm sorry doesn't seem to be enough...

So, it is apparent that I did something incredibly stupid and hurt/pissed off one of my very best friends who now refuses to speak to me. Upon reflection, I think I might know what it was, but I'm not sure. For all I know it could have been multiple things. I didn't even know she was upset with me until I talked to her husband. I've done what I can do for now, and all that's left is to give her some space, but I'm not sure what else I can do. :(