That depends in part on whether you are comfortable being friends with the sort of person who has such disregard for others that she would encourage someone to cheat.
This does not speak well of her character. Granted, she may have thought you were up for it, but her willingness to take part in such a relationship shows a lack of empathy for your wife.
Just something to consider. Willingness to screw over a stranger or acquaintance is a bad sign, IMO, and does not foster trust.
Hinge of a V relationship with my husband (Thumper) and boyfriend (T-Rex). Also, mother of a 6 y/o girl by my husband.
My poly story begins here
. Now with new blogging