Seeking title of film: widow, dead husband, ritual, portal

A number of years ago I watched a movie in which a married couple have an accident (I think) and the husband dies. The woman cannot come to grips with her loss. She seeks out help and finds someone that points her to a ritual (I think) or something … and she passes through a portal to the dead … she must stay in the light else things go “horribly wrong.” (Trope alert) This movie was not a horror flick, per se. Anyone have any ideas what the name of this film might be?
Thanks!