I dont care about firelink bonfire i just dont have the heart to kill lautrec :(

Will she die If I take firekeeper soul in new londo instead of blighttown?

Rang parish bell, picked up (not used) parish soul, never talked to lautrec. I went to firelink, no lautrec, fire keeper dead.no other bells rung, no souls either. (Remaster btw)

So she will never talk if I kicked lautrec off the cliff?

Oh my godddddd. I wasn't thinking about what I was doing after I killed Lautrec. I beelined it right for the Anor Londo firekeeper to upgrade my Estus Flask, and it was right as I clicked yes that I realized I had made a horrible mistake. I'm so sorry Anastacia, I didn't mean to. I just went completely brain dead. I really wish they would differentiate that soul.

Just found out she talks a bit more after placing all four souls in the lord vessel

It's not the fire keeper souls in undead parish and blightown that trigger lautrec to kill her. Its having 2 fire keeper souls. I found this out after starting a ng+ with 1 fire keeper soul (definitely not from either of the 2 spots mentioned previously because shortly after reviving anastacia i had no fir keeper souls but ended the run with one (no clue as to where exactly it was from but definitely not thw 2 listed above. Anyways i was speeding to get the two bells rung in order to unlock frampt for exploitative purposes and on my way i pick up the fire keeper soul from the undead parish and when i got back after ringing both bells i found out that the bonfire couldnt be lit because she is gone. So heads up on that onr. Please edit it to reflect its true nature.

Here's an interesting thing - if you try to kill Anastacia with a Shotel, which is Lautrec's weapon choice, you'll find out that ALL of your attacks either bounce off from the cage OR that Anastacia is out of range of your weapon. This little tidbit leads me to believe that the only way Lautrec could've killed her was if she dragged herself close towards the cage bars and LET Lautrec kill her, which also kinda speaks about the dude himself.

Considering how savage she was threated back in her village and how being a Firekeeper is a pretty painful existence, I can't really blame her for wanting to die. She even says that after you supposedly break the curse of the Undead, she can finally die as a human.

How do you know her name is Anastacia?

Tongue cut out, locked up, murdered by Lautrec and jesus christ the blood stained skirt description nearly made me throw up. This NPC is the definition of suffering and just continues with her duty anyway. Reviving her into a new untarnished body is the most heroic thing you can do in this game, nothing else comes close.