Devon Ke Dev...Mahadev S19 E04 Parvati leaves Kailash

Parvati expresses her gratitude to Mahadev for pacifying her. Mahadev tells her that he had to strive hard to rescue Ganga from Kali. He still feels that Kali has not completely transformed back into Parvati. What upsets Parvati so much that she decides to leave Kailash?