who is in the wrong

my mum gets so angry at me because im "looking at a screen all day" - i tend to make music mostly, or play on Xbox if my friends are on. Im energetic if and usually very active, but have been less so recently due to my legs rcovering from sports day - besides, weather hasn't been too good recently anyway. it's the first week of the summer holidays, and ive just finished GCSEs. Yes, I might be spending more than normal on a screen - maybe 4-6 hours, but is my mum justified in getting so angry to the point where she threatens to take everything away, and says im the reason she's unhappy?