The bell-ringing woman appears to be a mad Pthumerian.
-Sinister Chalice description
The bell-ringing woman is an enemy in-game who rings a sinister bell to summon invaders to your world. Defeating her will silence the sinister bell.
Can appear in any location where a player rings a Beckoning Bell or attempting to invade via a Sinister Resonant Bell.
Also known as the Chime Maiden
The bell ringing woman is not a difficult enemy to dispatch, they do not have much in the way of defense.
Be wary if you do not want to be invaded, find them quickly and dispatch them.
However, if you do want to be invaded, then do nothing to them.