Is it obligatory for a woman to wear the niqab when going to the mosque to memorize the Qur'an with a group of girls, especially if this is her husband's condition?

It is permissible for a woman to learn from a non-mahram man under certain conditions: that there is no woman or mahram available to teach her, and that the study takes place from behind a veil if possible, along with ensuring safety from temptation and adhering to Sharia-compliant guidelines, such as avoiding private seclusion (khalwa), speaking softly, and forbidden glances. Wearing the niqab is obligatory, especially in this situation.