Check out this NPR article: "For Kids With Anxiety, Parents Learn To Let Them Face Their Fears" by Angus Chen

Eli Lebowitz, a psychologist at the Yale School of Medicine, is examining whether parent training only, without including direct child therapy, improves child anxiety. He is finding very promising results, with an almost 70% success rate after 12 sessions. Parents in Lebowitz’s parent training are taught to validate their child’s anxiety, communicate confidence in their child’s ability to tolerate the anxiety, and reduce reassurance and accommodation. https://www.npr.org/sections/health-shots/2019/04/15/711213752/for-kids-with-anxiety-parents-learn-to-let-them-face-their-fears