She's not following the court order on communication

My ex is supposed to give me updates about the kids when they're with her but lately I'm lucky if I get one text a day. She says I'm being overbearing when I ask about their week or if they're doing okay. I'm not trying to be weird about it, I just want to know my kids are safe. The custody agreement specifically says we need to maintain open communication. I don't want to lawyer up again because that's expensive and stressful for everyone but I also feel like I have the right to know what's going on. How do you guys handle exes who are being difficult about this stuff?