Another direction could be that Dimitri eventually finds out about the pregnancy and returns. There could be a lot of drama as they decide whether to get back together for the sake of the baby or if they should just co - parent. Maybe there are family and friend reactions to consider as well. For example, Rose's friends might be angry at Dimitri for leaving her in such a situation in the first place.
Perhaps the fanfiction could explore how Rose's pregnancy affects her relationship with other characters in the original story's universe. She might become closer to some characters who offer her support, like her mother figure. And she could also face discrimination or gossip from others. The story could also show her journey of self - discovery as she prepares to become a mother, learning about her own strength and capabilities.