How can I talk to my friend?

How would you bring up a sensitive topic with a friend in a way that doesn’t hurt their feelings? I was recently talking to a friend about how I don’t understand women who are never with their kids, and she mentioned that she does a lot of things without her kiddos. She’s divorced so her kids go to their dad’s 2 nights a week, which of course is understandable. BUT on top of that she does a girls dinner twice a month, a girls weekened trip 1-2 times a year, a date night once a month or so with her boyfriend, AND this weekend she is going out of town for 2 nights with a friend without her kids. I was honestly surprised she told me. I worry her kids aren’t getting her full attention. How much “me time” does one person need before it’s excessive?