I'm not about to give parenting advice, especially since I'm not one myself and I'm quite young. However, parent or not, it's easy to see that she doesn't seem to take good care of her things. If I were in your shoes and if it was my child, they would definitely have to take on more responsibilities before I trust them with another phone that could put quite a dent in my wallet. Try more chores or something, again, I'm not a parent and don't know where to start or your "parenting style".
What I will say is this. For her next smartphone, should you choose to let her get one again, get an otterbox. Yes they're expensive, but they're cases that can take a beating, something your daughter seems to be good at doing with her phones. It'll keep the phone protected and keep your mind at ease a bit. Also, I don't know exactly how she can keep frying phones, but if she has the wrong charger plugged into it, maybe that could be the reason. Tell her to stick with the charger that came with the phone and you shouldn't have these problems, same for a car charger, get a known company, not some cheap knockoff you find on ebay (I recommend the Moto rapid car charger). Another problem could be moisture, though since you're from Vegas, I don't see that being a problem as it's pretty dry out there. If you wanna get her another phone tell her it'll be the last, she's 17, by the time I was 17 I had enough saved up to replace whatever I broke as long as it wasn't my car.