Exodus 21:11

ואם שלש אלה לא יעשה לה means IF HE DO NOT one of THESE THREE UNTO HER. What are these three? He should designate her to himself as his wife, or to his son, or allow her a deduction from the ransom so that she may go free (Mekhilta). This man, however, has neither betrothed her to himself, nor to his son, and she herself does not possess the entire sum paid for her originally that she might buy herself out, therefore shall she go out free without money. ויצאה חנם THEN SHALL SHE GO OUT FOR NOTHING (i. e. without making any payment) — Scripture adds in her case one more way of acquiring freedom than it provides for menservants. What is this additional way of acquiring freedom? This verse teaches you that she goes free also on account of having shown signs of incipient puberty: but she must stay with him until she reaches this stage of incipient puberty. For that she goes free if the termination of the six years happened to come before the signs of incipient puberty we have already learned, since it is said, (Deuteronomy 15:12) ,‘[and if thy brother], an Hebrew man, or an Hebrew woman [be sold unto thee], and serve thee six years [then in the seventh year thou shalt let him go free from thee]” (cf. Rashi v. 7). What then must be the meaning of what is stated here, “she shall go out for nothing”? That when the signs of incipient puberty appear before the six years are at end she shall go out on account of them. Or perhaps Scripture states here that she shall go free only when she has reached the intermediate stage of womenhood (בגרות, fuller development after twelve years and a half), if this stage happened to be reached before the termination of the six years! To teach this Scripture states “without money” — which would be superfluous since it has already said “she shall go out חנם” — in order to add as another date of her acquiring freedom the time of her reaching this stage of womanhood. And though it necessarily follows that she goes free an reaching the state of בגרות since her freedom is brought about even by the earlier stage of נערות yet if Scripture had not used both terms (both חנם and אין כסף), I might have said that ויצאה חנם refers to the stage of womanhood; therefore both expressions are used in order to give a disputant no opportunity to offer a different explanation (i. e. Scripture wishes to be quite clear on the point in order to preclude all possibility of misunderstanding) (Mekhilta; Kiddushin 4a).

וְאִ֨ם־שְׁלׇשׁ־אֵ֔לֶּה לֹ֥א יַעֲשֶׂ֖ה לָ֑הּ וְיָצְאָ֥ה חִנָּ֖ם אֵ֥ין כָּֽסֶף׃ {ס}        

And if he do not these three to her, then shall she go out free without money.