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Well, when it is proven to be a danger to her health, for her life, it could be. But even with natural planning, sometimes it is not so. There are cases where there was still a conception. In this life, we have no 100% guarantees. I think in this case, she must pray with her husband to the Lord to illuminate them, to serve His commandment, not to offend Him, and to do His Holy Will.
Well, natural planning is allowed by the Church to be used in marriage during these infertile periods. It is allowed.