The Regional Building Committee (RBC) is basically a group of volunteers who handle KH / Assembly Hall construction / remodel. Many female volunteers are in there, and what they do range across all sorts of skills. I've seen some finished carpenters, some accountants, some roofers, etc. Most unskilled ones will either be selected to be training in an area that they express interest in, or they'll end up in the kitchen. That's fairly typical. About the only thing they can't do is be an overseer. Only elders can be overseers, skilled for the position or not.
She can't just work on any local project, though. Each volunteer has to be specifically assigned to work on a project.
As the name indicates RBCs are local. To go back to work at new Warwick project or any other non-local project, she'd have to fill out an application specific to those projects. About the only thing that she might be asked to help with, if necessary, is if a natural disaster hit elsewhere in the country. Then RBC volunteers from all over the country would be asked to help.