I think there is a mistake in the logic for Charlotte's path. Throughout this update, there's a bunch of dialogue that comes up only if you were on both Charlotte's path and Lucy's and turned Lucy down at this point:
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If you reject Lucy at this point mom_choice_04 is set to 1, but not if you turned Lucy down in the earlier updates.
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This dialogue comes up only if you rejected Lucy in this update. So looking at the code, if you don't get the choice to reject Lucy in this update, then you are basically no longer on Charlotte's path.
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For example, Charlotte's attitude changes if you made that choice to reject Lucy this update (but if you didn't get the option to choose, then it's assumed mom_choice_04 is 0, so false):
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I doubt this is intentional, it just looks like faulty logic to me. If you rejected Lucy in the past updates, that shouldn't put you off Charlotte's path this update. I don't know if the dev cares to fix it at this point, but maybe somebody can pass this info to him.