Qadha and Kaffara

Husband forcing wife to break Ramadhaan fast to engage in sexual relations

Q: What do the scholars say regarding A woman who fasts during Ramadhaan. Her husband is not normally home and comes home for a week during Ramadhaan and forces her to break her fast for sexual relations and he himself doesn't fast. What should this woman do for her fast? Ss she committing sin by this act? Please give guidance.