So far we have got rid of all the diegetic sound within the house but kept the woods parts. We are also thinking about non-diegetic sound such as a radio playing.
So to make our idea more clear we are considering having a radio playing instead of music. The radio will be a newsflash saying "1 year today that the girls went into the local woods and tragically only 1 survived, but it is still an ongoing mystery". This helps anchor the date of the film and makes it more understandable for the audience.