If Mum had broken her hip, and was not suffering from Dementia, would you visit her in hospital every day?
In all honesty, I would not travel those sort of distances every day, unless ( and even then I would try to get the hopital on side) unless I was the only person to get Mum to eat or sleep.
Your Mum is not on her own, she is under 24/7 supervision. I don't know where your Mum lives normally, is she at home or in residential care? Does she recognise you and respond to you?
I think that you can cut down your visits and simply telephone the ward each morning and see how she is. You can always visit if the news warrants a visit.