Moses continues speaking to the people of Israel as if he were speaking to one man, so the words "you" and "your" are singular. (See: [[rc://en/ta/man/jit/figs-you]])
She will do this after the man brings her to his house and when she shaves her head and cuts her fingernails and toenails as mentioned in [Deuteronomy 21:12](../21/12.md). The full meaning of this statement can be made explicit. Alternate translation: "she will take off the clothes of her people and put on Israelite clothes" (See: [[rc://en/ta/man/jit/figs-explicit]])
This is a polite way of referring to having sexual relations. Alternate translation: "After that you may have sexual relations with her" or "After that you may lie with her" (See: [[rc://en/ta/man/jit/figs-euphemism]])