Question: what to do when someone likes your husband?
Answer: Give her the benefit of the doubt. The first, second and even third time it happens, shake it off. ... 
Never retaliate in kind. As Michelle Obama memorably said, when they go low, you go high. ... 
Put yourself in her shoes (try really hard) ... 
Laugh. ... 
Out her. ... 
Speak up – calmly. ... 
If all else fails, tactfully drop her.