My phone is on silent at night because I don't want to be disturbed by the non-stop spam calls everyone gets nowadays. Or the fact that she was just at work beforehand and had it on silent. This is not unusual, and certainly not the problem in this story. The fact that they didn't even ask her mom if she knew where she was means this was entirely about controlling her, if they actually cared they would've woken her mom to check but they just wanted to bully OP for staying at her boyfriends (which they probably assumed and didn't like).

Your suggestion of appeasing people who are being unreasonable and arguably abusive is not a suggestion that will fix things in the long term.