Do you think this was very rude behavior for these sweet teenage granddaughters?

I have a friend who has flown up north to spend ten days to two weeks per year with her son she adores, his wife and their cute teenage daughters. She can’t stand her daughter in law but really loves her son and granddaughters.
Anyway, last year they told her she could only spend a week. She was hurt but flew up there anyway and found that her daughter in law has a full time job as does her son. The daughters were out for the summer and spent most of the day in their rooms with their phones as my friend sat alone in the den all day. A few months later my friend asked her son if she could come again this year and he said, “I don’t know yet; we have a lot planned.” Next thing she knew they flew down to Texas for three days. I think that was the last she’ll see of them this year . Do you think the kids were rude to ignore her? They still all went out to dinner and had a shopping trip. Its so sad to me because she has had several mini strokes and her family may regret treating her like this.