DD1 has been going to the same preschool for over a year. Changed rooms in June, all was fine. Now, for the past month or so, she went from running to her friends happily to crying, clinging, hysteria at dropoff. We have talked to her teacher who says she seems happy throughout the day and she seems happy at pickup. I'm still worried. Help me out here, please, is this a phase or something I should b concerned about? FWIW, she potty trained about 2 months ago. No other new stuff at school like staff changes or friends leaving. TIA!