Hi, Atlsportsbabe.
Welcome to the Apple Support Communities. We know that Messages is an important tool for staying in touch. We can understand why you’d want to find a resolution so your messages are delivered in your group chat.
Does this happen with all message threads or just this one in particular? Work through the steps in the following article: If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
We hope this helps. Don’t hesitate to reach back out with further questions.
All the best.