Hey Madjokim,
Thanks for using Apple Support Communities! I understand your daughter is experiencing an issue with iMessage conversations loading at the start of the conversation with every new message.
The first step if not already done, would be to restart the device. A restart is a simple step that can resolve a variety of issue. You can see how to do that here: Restart your iPhone
If this continues after restarting, try deleting a current conversation and then starting a new one to see if the same behavior happens with a new conversation.
You may also want to consider updating to the latest iOS if the device isn't already fully updated. Check out how to that here: Update your iPhone, iPad, or iPod touch
Thanks again, and have a great day!