There's plenty of evidence that using computers particularly for long periods affects your ability to concentrate - being on screen gives you a "buzz" like coffee or a cigarette, but then these things are addictive too.
My DD is 17 and spends long periods on games; she was always interested in that sort of thing, went to technical college to study computing so its her hobby, and when she was unhappy at school it was a huge release for her. She's formed friendships on line, but the skills for friendships were always difficult for her even when she was pre-school and throughout primary, before she started gaming.
She is also a talented digital artist, she likes transient media and posts her work online (she's at art school now studying - digital media!) so its a huge part of her life; a life which is almost unrecognisable from the way I grew up. I don't think young people are particularly advantaged by all this, I'd hate to be a teenager now, and I don't think we know the full extent of the damage this is doing or the physiological changes, but it is something that can be researched - online!
Its not only young people who get hooked, I know i feel anxious if I can't get online, I write and work from home so I am on screen for hours at a time. I don't have all the answers - I make DD take breaks and insist she walks the dog and comes down for meals. When I go to bed, she has to, lights out, phone off. She doesn't have half term as her college operates on university terms but when she is off at home I insist she goes to bed by 2am, or earlier if I can manage it. She's not found a job yet so is often in bed all morning, I don't mind - again, something else well documented is that teenagers like to sleep and I remember getting up at 2pm on Sundays to have a roast dinner!
So OP is right to be concerned, but there are some things she can do to mitigate the effects. Choose your battles OP but regular breaks and coming into a family room, etc having a drink or meal, will all help. BTW a few years ago I used to fight with her about it and her defence was always "its normal!! Everyone does it!!" - well, everyone shouldn't, without any care or concern for their wellbeing.