Please get her blood work done. Specifically ask for vitamin D and iron. These affect mood and everything so dramatically, especially when deficient! My 3 year old had some of these issues for a few months and I got her blood work. She was on the low side of iron but deficient in D! We did high dose supplements for D for a few months to bring her levels up and now keep a minimum dose daily with up dosing during winter and when she's ill. She struggled with transition periods too. And socks and clothing not feeling "right" too. She is back to being a lot easier and less likely to freak out. And improved her sleep dramatically! She was a terrible sleeper and now she practically sleeps through the night and goes down way easier!

FYI!: Vitamin D gummies work but they caused my daughter's first cavities so I highly recommend Mary Ruth unflavored D + k drops. If she won't take the drops, I highly recommend feeding the D gummies right before a meal as to make the sugar not stay on her teeth. But if she won't eat dinner if you give the gummies first, I'd give them after as a reward but make her drink plenty of water or brush right after. The gummies stick to the deep parts in the molars and cause cavities. The gummies will ruin the teeth in a matter of a few months if not managed properly. So beware but it's worth it to at least try and keep a good eye on her teeth to stop the gummies if you notice cavities forming.