Personally, I'd do her nails. Even if she is going to you to try and get information, oh well. You're there to do business not chat about your partner so I'd greet her with a smile, keep conversation to general topics and at the end of it take her money. Prove that you're the bigger person. She may not know she's making you feel this way, or if she does and she enjoys it, stop her from having this hold on you and your partner, he chose to be with you again.