When I went to camp for the third time, Shadowheart was kneeling down, head down, as if in prayer. I wasn't able to talk to her at all, and figured I couldn't disturb her or something.

But now I can't talk to her at all anywhere. Camp again, same thing. And I can't talk to her to tell her to leave the party.

This happened after - Shadowheart background spoiler -
I succeeded a persuasion check or something and she told me she was a cleric of Shar outside of the camp. Then we camped, and this happened.