We can only help with information given. Your first post was not clear and many gave good advice using information they were given.

No, I don't call a parent to get their child if they are crying. The only time I call parent during day is if child is sick. We don't always get smooth days and that same in any job. Crying child is part of job.

And no, I don't see her not responding to you as a red flag. If child in your care, most parent will answer phone when you call. But child not in your care right now, and she has own schedule and commitments. Most parent prioritise calls. When mine home, if phone rang, I would glance at caller ID. If school calling, I would answer if during school hour and my child there. If school called in evening when my children home and safe, and it was not convenient, I would not always answer. They could leave message and I get back when it convenient. No urgency if my child is home and safe.