We made it! This is also known as The Sylvian Experiments so I'm expecting Elfs... or small woodland creatures...
A husband and wife witness experiments that allow victims patients to see reality, and their small kids witness the light... cut to later, the mother is now a rather psychotic doctor who is repeating the experiments, and her latest subject happens to be her own daughter. The sister is trying to work out what is going on, and gets caught up in her mother's plans and her sister's new take on reality.
It's weird, and I think I got a grasp on what was going on, but it's easily possible that I mixed up who was whomst. The movie tries to make a deal out of seeing the reality, and it being the afterlife, but the effects can't really keep up, and the best we got is strange contacts in the actresses' eyes, and really bad CGI light effects. And possibly the whole thing was a dream, I'm not sure...
This movie has a concept it is wanting to portray, but doesn't pull it off well. It isn't terrible, but it's not great.