It's not as if she had much of a choice.
And that's the problem, isn't it.
As the Lamb adds another bed to the dormitory, she thinks, exhaustedly, about what she's doing and why she's doing it. She remembers realizing that it's not worth it, to purchase safety at the cost of becoming a Bishop. Well, what is she becoming? She used to be able to feel things besides tired despair and the looming premonition that if she remembers how to have emotions again she'll be instantly crushed under the weight of them. She used to react to Heket's nonsense by rushing home to save her people. She used to be able to consistently remember to wait for people to express a decision before she pockets them.
Or did she? Can she remember for sure? She can't think through the fog in her head. How sure is she, that she's asked every single time?
And if she did ask, or wait to be asked, every single time she took a follower... so what? She bought Hutrear from that spiderfolk; sure, he seemed to be grateful for the rescue and eager for a new life as her Follower, but how hard did she actually try to check? Sure, she didn't really have better options—releasing someone into the woods alone isn't much better than killing them—but if someone would rather be released into the woods alone than join her cult, she should offer them that, and she hasn't been.
And... even if it's the best she can do, and even if they did all choose it from among their small handful of shitty options... it still, fundamentally, doesn't sit right with her that she's doing this. It still, fundamentally, isn't right, that she's doing this.
What other choice does she have, though? Would her followers thank her, if she "freed" them all to starve and die alone without her? She hardly thinks so. Would the One Who Waits Below take it kindly, if she jettisoned her whole camp and trudged back into the mushroom forest for a suicide mission against whatever the next awful beast is? Not bloody likely.