Wow. First things first, how is she? I hope that she wasn't hurt too badly.
No harsh commentary here, DD. Just some advice. You've mentioned before that Rudy was getting increasingly nippy, so this marks an escalation of an existing pattern. You need to be very careful going forward, both for the safety of the people around you and for Rudy himself. A macaw beak can break a finger if said macaw is so inclined, and I know you don't want anyone getting seriously hurt by Rudy. On top of that is the possibility of Rudy being seriously hurt as well when the bitten person reacts. And finally, you have to consider the legal ramifications should someone seek to take legal action against you.
I think that you need to determine why exactly this is happening. Is it that he's coming into puberty and hormones has him a bit grumpy? Or is there something inherent to the situation itself that is rubbing him the wrong way? Mark you, even if something in this woman's behavior triggered the event, the onus is still on you to prevent it from happening.
Here is a link you might find helpful with your situation:
http://www.parrotforums.com/training/57935-brainstorming-biting-parrots.html
Personally, I always take the possibility of my birds biting anyone VERY seriously. And some birds are just less reliable in this regard than others. For instance, only close friends or family who are VERY familiar with Maya and understand all of the inherent risks that come with the Ginsu blade attached to her face are allowed to hold her. A stranger or someone new to her would never be allowed to try and touch her.
Jolly, on the other hand, has literally never bitten anyone. He truly lives up to his name. So if someone was curious about birds and wanted to try having him step up for them, he's the one I'd choose. But only after going over how exactly they should approach him to minimize his anxiety about meeting someone new. And if he eventually did start getting a bit nippy, I'd dial way back on those privileges until he had once again earned my trust in that arena. Or until I'd determined what exactly had triggered the change in his behavior and eliminated it as an issue.
This caution protects the people with whom my birds come into contact, my birds from accidental reflexive harm, and me from any fiscal ramifications.