The OW fished about 4 times. One as late as a year plus out from the A. We ignored. She went away when she found a new playmate.
That is what it is... fishing. Nothing more. Any type of validation/ attention, even negative attention gives her a hit/high. It is pathetic. Don't give it to her.
Burn her item, or toss it, put it on the neighbors dog... But stay NC.
It is a good sign that your H told the truth. Now you can deal with it like the team that you are. What is the plan if she decides to make follow-up contact with your H? How do you guys think it should be dealt with?
Perhaps you can have a strongly worded letter sent to her from a lawyer stating that if there is further contact you will be filing harassment charges.
It's okay to be mad. Even ticked off at your H. He invited her in without considering how it would all shake out. It is okay to be pissed.
But be pissed with a plan.
Hang in there.