After the story in Days Gone, Sarah is specifically at the main survivor base. This base serves as a refuge for all the people left. It has different areas for different functions. Sarah is likely to be in the area where they plan for the future, like strategizing for food resources or defense. Since she is an intelligent and resourceful character, she is involved in important discussions. For instance, she might be in a meeting with the leaders to talk about how to deal with the remaining threats outside the base. She also could be found near the medical facilities within the base, as she has medical expertise and would help out there too.
Yes, she can be found at the central base of the survivors.
Sarah can be found at the survivors' main encampment after the story in Days Gone. The encampment is a large area that has been built up over time. There are living quarters, storage areas, and a medical tent. Sarah is often in the medical tent as she has medical training. She helps to take care of the sick and injured survivors. But she also moves around the encampment to communicate with others and contribute to the overall organization and development of the place. For example, she may be involved in discussions about how to improve the defenses of the encampment or how to increase food production within the area.