I just wanted to give another little update
Layla is still getting braver every day! If she gets too hot in her bed at night, she will crawl out and lay down on the hardwood floor. She has no trouble scooting back and forth between the living room and kitchen on the hardwood either, and if we're upstairs for too long and she misses us, she will scoot across the hardwood to the bottom of the stairs and bark until we come and get her
Last Thursday we went to the pet supply store to get some food, and we saw a 50% off bin and Layla and I went over to look through it. We found a seatbelt harness, size Medium for 20-40 lb dogs

but we decided to try it on anyway. Amazingly, it fits! Her upper body is so muscular now. So we bought it and gave it a try on the ride home. I fed her some treats on our way out of the city and she didn't make a peep! I think we have found our solution

We drove almost 3 hours on the weekend to visit Scott's parents, and she didn't sleep but she just laid there on the backseat on her little blanket the whole way back home (she cried a little more on our way there!). This morning she was really good again, although she did cry more in the city. But at least now we know she's strapped in GOOD and she's not going to fall off the seat or try jumping to the front seat and she won't get hurt. There's also nothing for her to chew! Her carrier was getting pretty beat up
The weather is starting to warm up a little here and the snow is just beginning to melt, so we're going to be able to spend a little more time outside soon! She is just loving the time she gets to walk in her cart from the car across the parking lot to the office, and back again at the end of the day