Is what I read from one of the jurists correct, that a woman experiencing irregular bleeding (mustahadah), after her usual menstrual period, performs one ghusl for her purity, then performs wudu for every prayer if the bleeding continues, and she is permitted to combine two prayers—Dhuhr and Asr—with one wudu, as well as Maghrib and Isha with one wudu, just as she is permitted to perform ghusl for every prayer?

What is mentioned in the question regarding the rulings for a woman with irregular bleeding (mustahadah) is correct. She is obligated to perform ghusl (ritual bath) after her menstrual period ends, and she must perform ablution (wudu) for each prayer. It is permissible for a mustahadah to combine Dhuhr and Asr prayers with one ghusl, and to combine Maghrib and Isha prayers with one ghusl, and to perform ghusl for Fajr prayer. It is also permissible for her to combine two obligatory prayers with a single ablution as long as the time for the obligatory prayer is still valid.