I figured she might be leaving when SJ was crying about Mumani leaving and then saying Alka and Shalini were with her from day 1 of the show. So I think she is very upset ATM, which is to be expected. Her closest confidants of the show are leaving.
Hopefully Dilshaad does come back for the end of the Billi track! I SO wanted her to see Billi's end. She at least got to see Razia's, so that is some comfort, and she got to see her granddaughters reunite. She did what needed to be done, save Seher from Billi and tell her who she is! So that part was really good!
I will miss her for sure! This is the end of an era for QH!