I will admit that I don't work the program yet, and was a little surprised by the deference to the sponsor. I guess if I think about it, if your sponsor really is a trusted advisor to you, then he/she will know if you are truly ready - i.e. honest in motive, and aware enough to do it, without justification or attempt to assign blame. With that said, please put my forthcoming opinion in the context of not knowing the proper protocols or responsibility of amends.
[I will write this opinion in a directive voice - please don't take it as offensive or authoritative...it's just a writing style]
I'd suggest that you send her a note. You are fully transparent, and acknowledge that you left her prior email hanging. You let her know that you have hit a juncture in your sobriety where you need to do right by her, and acknowledge the failures of your actions in the relationship. You be very specific that you are aware of the potential manipulation of emotions that can happen from such an amend process, and that you don't do it with irresponsible or manipulative intent. I'd close with the acknowledgment that a non-response from her is perfectly acceptable, and that she is not on the hook for curing or accepting your crazy - but now that your are of clear mind, you felt the duty to reconcile the damage you caused. Finally, give her an out. Let her know that even if she wants to chat, that maybe 3 or 4 weeks should pass before you do. If for nothing else, to give her time to reconcile her thoughts and to fortify her enough so as not to follow-up with you out of emotion, but of clear headedness.
........but then again, I'm a bit cookoo, so feel free to ignore.