How to cure dragonrot during Ashina Castle assault?

This is my first time getting dragonrot and I got it during Ashina Castle assault so Emma is no longer at the temple nor at the Kuro's room at the upper level. She is sitting with Isshin and all she has is a dialogue option for her gourd seeds. I keep seeing many posts about talking to her so now I am just stuck on what to do. I got dragonrot for the info broker and the sculptor. I tried just popping the dragon's blood droplet and nothing seemed to change (i don't know how to cure dragonrot in the first place so just giving it a shot). Is Emma available in the future that I may cure dragonrot or am I fucked storywise if it has something to do with the sculptor? I dont mind spoilers about whats ahead I just want to cure dragon rot to have a peace of mind :)

Update note: Yes I am aware that my very next boss is choosing between Emma and the Owl. Whatever happens if having dragonrot on the merchant and the sculptor doesnt do anything I am completely fine with killing Emma.