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A woman that made a Hefsek Tahara and counted for 6 days, but then didn’t count the 7th and didn't go to the Mikvah since she was not going to have sexual relations. Another 10 days passed.
Can she count the 7th day and go to the Mikvah?
In the interest of learning, I saw in R' Zvi Sobolofsky shlit"a's sefer "The Laws and Concepts of Niddah", Chapter 26 "Counting the Shivah Nekiyim"- a responsum of the Me'il Tzedakah(1678-1712):