Yes that is very true. There aren’t as many reptile vets as there are regular vets. Here in Adelaide, I know of 2 vets who specialise in reptiles and that’s it. The same goes for birds. I rescued a bird on the weekend but couldn’t take it too the vet so I had to care for it over the weekend, then when I took it in the nurse thought I had no idea, when I had been trying to explain to her that I’d been caring for rescued birds for 13 years but I needed them to take it because I can’t afford to care for them anymore. She just kept saying ‘you know it may be euthanatized if nobody can’t help it’. I wanted them to take the freaking bird! Then there was the time one of my birds got sick and I literally called every vet I could access for 2 days before I ended up having to take him to a breeder because no vet would help. All because it was the weekend. God...
Sorry that was way off topic, but I just find it frustrating when help is not available when it’s needed. The moral of my irrelevant whinging is- if you ever have a pet that gets sick try and get professional help immediately if you are able to, you can also try contacting a reptile dealer to get some advice. If you aren’t able to get vet advise then that’s the next best thing. The 2 most important things when supporting an ill animal is warmth and hydration. You must keep it warm and you must keep it hydrated. I think from what I read you did that, so that is good. You may be able to take her to the vet and still find out what killed her if you wanted to. And definitely clean out your enclosure properly, get rid of the substrate, and make sure everything is cleaned thoroughly incase it was an infectious disease.
Again I’m really sorry your lizard died, I hope you feel better soon.