White pupil. What do you suggest.

History:My mom was operated for ca endometrium on 10 may 2021 , no therapies as he stage 1a and grade 2 so dr's said surgery is enough. She already had cataract in both her eyes but ignored it as we got busy with other things Now issue is that some months back her eye got hurt and she was saying she is having slight pain. When we consulted Dr they said she is having cataract and needs to be operated for it at that time they said they see hazy view but again she was operated for gallbladder (biopsy report normal) and it was delayed. We again visited the dr and they said she is having no view when they put some drops in her eyes her pupil turned white for both eyes and then for right eye it stayed white only and i can visibly see it white. When we told them she is having slight pain around her eye they said it is not related to eyes. In confusion we consulted other dr he said the same. But since she have history of malignancy we want to be sure if it's just cataract. What do you suggest.