Zion rejoices in her daughters.

Hello. Personally, I’m not really enthusiastic about such a change. In Bani’ah it was said about everyone, since in Hebrew the masculine is also used to describe a common group of genders. Therefore, the change is stupid and unnecessary. But on a halakhic level, it seems that there is room for permission. First, a Mishnah from Tofs came out according to Ram against Rabbi Yosei, like whom most of the Rishonim ruled. Even Rabbi Yosei has opinions that this is a significant change in which a substantial detail in the blessing is changed, and not a literal change of words. Third, according to the Rabbi, the change is only disallowed in a closed list of blessings (and this is not one of them). Finally, this is an addition of a word after the blessing (as the Gra’s students used to add: “And concerning the economy, the Gaon said not to say”), and it is doubtful whether this is a change. All of this is applied here with regard to the law of rabbis who have reached the point of being co-opted. I found a nice overview of the topic here: https://www.etzion.org.il/he/halakha/orach-chaim/prayer-and-blessings/%D7%94%D7%9E%D7%A9%D7%A0%D7%94-%D7%9E%D7%9E%D7%98%D7%91%D7%A2-%D7%A9%D7%98%D7%91%D7%A2%D7%95-%D7%97%D7%9B%D7%9E%D7%99%D7%9D-%D7%91%D7%91%D7%A8%D7%9B%D7%95%D7%AA