Your over dusting with d3.
Like said above, you should dust with D3 about 2x a month.
I dust without D3 every other feeding and
with the reptivite about 2x a month.
People mostly recommend anything lower than 50 degrees take them inside.
50 would be pushing it and but that being said I think your chams would be ok, IF...
the temperature has gradually gotten to that low of 56.
IF the 56 is just a spike down in temps your chams might not be...
Meanwhile, change your setup ASAP. Take out the substrate, get an exact number on the temperature/ humidity. Get some real plants. Chameleons aren't fine one day and then bad the next, they take a while to deteriorate as well as to improve. You have to change the cage!
I once had a baby dubia escape from the feeding cup. I looked everywhere on and off for about 3 days with no luck.
I figured he would die to so I eventually just gave up.
About 6 months later, as I was digging through the chameleon supplies to get some of my dry cricket food, I see...
Here, check out Summoner's working free range setup.
Like stated above, a bit more than a shower curtain is needed.
https://www.chameleonforums.com/new-free-range-works-31428/