It's obvious from reading some of the other reviews that most don't know that this film was entirely improvised. In other words no script, just an outline of what they want to touch on and to go from there. It didn't work very well.
Consequently it resulted in the two main characters, Kate Winslet as the mother and Mia Threapleton as the daughter (both real life Mother and daughter) spending a great deal of the film arguing over each other, which is more accurate realism but also hard to follow.
Kate Winslet is Ruth and she's concerned about her daughter and her obsession with social media on her cell phone. A definite need for a hard look into this new problem that's facing many today, but not well told here. The improvisation tends to leave overly long pauses as well as a lot of arguing, but not real dialogue. I really wanted to like it but it was a struggle. It's a good example of why there are script writers.