The wife was not fasting. The husband who was fasting indulged in sexual relations with his wife.

Answer

The husband has to keep sixty consecutive days of fasting as the kaffaarah for destroying his fast of Ramadhaan. While there is no kaffaarah on the wife since she was not fasting, she still has to make qadha. She is also guilty of a very serious sin for having submitted to her husband's evil/ haraam desire. She is instrumental for this difficult kaffaarah which her husband has now to observe.