Reference for Niddah 135:9

ותמה על עצמך היאך חופפת ביום וטובלת בלילה הא בעינן תכף לחפיפה טבילה וליכא

but in fact it was this that was reported in the name of R. Johanan, 'A woman may not wash her head on the Sabbath eve and perform immersion at the termination of the Sabbath'; and, furthermore, it would be surprising that a woman should be allowed to<span class="x" onmousemove="('comment',' Lit., 'and wonder at yourself how'. ');">⁶</span>

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