Hi, all! I hope this hasn't already been asked . . . I did an advanced search and couldn't quite find the topic I was looking for, but please feel free to direct me if there's already a thread addressing my question. I'm wondering if anyone has had any experience with leaving cookies decorated with royal icing in a hot car for part of the day? I have an order that I'll be sending with my mother in law, but before they get to their final destination, they may have to sit in her car for a few hours, and it's been in the upper 90's to 100 degrees here lately. They'll be individually packaged and heat sealed, but I'm worried about the heat affecting the texture of the icing. Is my worry justified? I could send them in a thermal bag with a cold pack if so, but didn't know if that was necessary. Thanks in advance for the help! I've always been able to deliver directly, so this is the first time I've had to worry about them staying out in the heat for too long.