can i be locked out of miliscents quest? SPOILERS

so i just killed malenia and gideon ofnir and i wanna do miliscents quest,she has alr invaded me in the swamp of aeonia and after i got e needle(idk if it was broken or not) from commandder o nail in the swamp,i talked to a gyu sitting in a chair in a red cloke that told me to go find her

and i wanna do that now,can i? what shouldnt i do for me not to be locked out?