She doesn't apparently have any desire for her current husband, is admittedly not poly and jealous. She speaks of your husband very affectionately but says she is ok with a casual relationship. I'd keep an eye on things. She's not telling her husband because she doesn't want to lose security for her and her kids...but what would she do if your husband was willing to provide that? My guess, she'd gladly replace you in a heart beat given the window of opportunity.
Be careful and stay healthy.
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over