Caroline would likely be a mix of excited and cautious. She's a bit of a romantic at heart, so she might see the potential for a new family dynamic. However, she also knows Katherine's past and would be on guard to make sure Katherine doesn't manipulate Damon during the pregnancy. She would probably try to befriend Katherine to keep an eye on things.
The movie 'Mildred Pierce' is not based on a true story. It's a work of fiction crafted by the filmmakers and writers to entertain audiences with a compelling narrative.
In my opinion, 'A Cup of Tea' is one of the best Katherine Mansfield stories. It's a short but powerful story about a rich woman's encounter with a poor girl and how she deals with her own sense of superiority. 'The Fly' is also quite good. It uses the simple image of a fly to explore deeper themes like death and the futility of life. Also, 'The Doll's House' is a great story that tackles issues of class and social exclusion among children.
There's no evidence to suggest that Katherine Barrell reads fanfiction. Fanfiction is a bit of a niche area and not all actors engage with it. It could be that she's never even been exposed to it or she might be into it privately, but without any statement from her or her team, we can't really know.