Simple story and Synopsis

So, now I know my story, and it is going to be a very simple storyline. I just need to figure out how she gets from one world to the other. 

This is my rough storyline:

Little girl playing with toys, muffled arguing in the background, she wishes to be in another world with her toys.

In the world, its happy at first, but then turns bad, as her parents are getting closer in reality, she can't escape them in her fantasy, the world gets scary and the giant toys are stumbling over her. She tries to run and hide and somehow finds a way out of there. Back in her bedroom her parents are fighting right in her doorway. 

Also, now I am confident with my idea, I have developed my initial synopsis:

'A little girl finds a fantasy world to escape her parents arguing, but even in there her fears catch up with her'