Merriam is a highly regarded trauma surgeon sought after for her skills. She cares about Felix and is concerned at the turn his life has taken since her sister’s death. Felix is really her last connection to Anna. (She got her start working as a medic on a Doc Wagon).
Merriam has also begun caring after and assisting Sidestep with her augmentations. Probably because Sidestep is just as damaged as she is.