Shadow Kids (2008)

This family drama deals with a case of Munchhausen Syndrome by Proxy, a fabricated illness. Stephanie is an apparently happy single mother of two daughters, Therese and Agnes, although the latter suffers from chronic health problems. When Stephanie's sister Christiane visits them, Agnes collapses during a theater play at their school and later dies in a hospital. Due to Stephanie's odd behavior, Christiane tries to find out the truth about the death of her niece...