If a woman waits until asr to see her purity even tho at dhur she was dry but she wanted to make sure about her purity so she waited as in the past she had to take ghusl three times bc of being impatient (she doesn’t get white discharge) if she takes ghusl after asr, should she pray dhur as well?

Ustadh AbdulAziz al-Haqqan

Purity means u see the white qassah, or if you put a piece of cotton or something similar and it comes out dry without any blood or yellow or brown discharge on it. So, if this was your case at thuhr time then pray it yes.