My mother is in her mid fifties and is increasingly isolated. She does have friends but they're mostly married (she is single) and she doesn't have any hobbies, or want any.
Basically, she wants me to spend a lot of my free time with her. We live 3 hours apart and her house is not near any of my friends' so it's an effort to get there. I already see her for a week at Christmas, a weekend approximately every two months and a week's holiday in the summer, but she now wants another eight days next summer too. This would be three weeks out of the five I get as annual leave and I actually want to holiday with friends or take time off alone too... I work very hard and have a lot of friends I want to see, as well as time-consuming hobbies I want to do. What can I say that is tactful and how can I encourage her to make friends? I have suggested she takes up various activities and tries internet dating but she's not particularly interested.