popa bar abba
YD 198:6 says its dangerous to undo them. The Pischei Teshuvah has a long piece over there about it. Still it says braids that are attached to each other. I wonder if they actually look like normally braided hair.
Also woman braiding hair is relatively common among Yerushalmis and some Chassidim based on kabballah similar to the concept of tefillin shel yad and akeidas Yitzchok. Although that is only among girls and not married woman.