It's a psychological problem why she might be gambling. She needs help and not being ditched since she is part of your family. She has not been gambling before and some persons are more prone to addictive behavior. I am not a psychotherapist but looks like she has lost her motivation/dreams/purpose in life and needs help to get back into life.
There is a 'give way' sign for the car. Not sure why as the car stays in the same lane while merging onto the main road. But maybe because of vehicles crossing like that .