en_tn/lev/15/19.md

menstruates ... her period

Both of these refer to the time when blood flows from a woman's womb.

her impurity will continue

"she will continue to be impure"

will be unclean

People and objects that other people must not touch are spoken of as if they were physically unclean. (See: rc://en/ta/man/translate/figs-metaphor)