No one has ever complained of looking «too wide» and since creating upper body width is the main
thing side laterals help to achieve, you should try incorporating some variety of the exercise in every shoulder workout.
Rolling
side to
side slowly when changing, helping her slowly transition up and down from sitting to lying down and back up again on changing table, encouraging reaching for toys when on hands and knees so that one hand is off the ground without collapsing, playing «row row row your boat» on your lap moving
side to
side and having her hold those tricky sideways positions are some examples of
things you can do during the day to help her get used to
lateral weight shifts.