Her approach is defined by narrative and domestic observation. Kruijff used watercolour to document the private lives of the Dutch middle class. She avoided the heavy, dark tones of the earlier Hague School. Instead, she used a lighter palette that suited the interior spaces she painted. Her figures are often caught in moments of quiet observation. The way she positions her subjects suggests a psychological depth without relying on dramatic gestures.

Modern collectors value Kruijff for her ability to document a vanished social world. Her paintings act as visual records of late 19th-century interiors and costume. The domestic scenes provide a sense of calm that fits well in contemporary living spaces. Her work bridges the gap between traditional Dutch realism and the fluid styles of the early 20th century. These prints offer a window into the private spheres of the past.