I send cat photos once or twice a week. And occasionally something funny, or that I think she might find interesting. And she does the same to us—something new she’s trying, something funny she saw, something she knew we’d appreciate. DH is more likely to ask about weekend plans and whatnot, but the response rate is about 50/50.
I did ask her to turn on read receipts, so I at least get proof of life even if she’s too busy to respond. She’s actually a terrible texter, even with her friends, so I don’t fuss too much unless I’ve asked a specific question.
We did try to work out one or two potential calling windows each semester, where she had no classes scheduled and her dad and I were both likely to be home. If she called, great. If not, it probably meant she was out having fun or doing homework. Both of which are very good things.