waterfalls are a big "no-no" they are basically a breeding pool for bacteria and thatll make ur chameleon sick and possibly die, so yes if u dont clean or refill the waterfall with new water everyday it is bad water
yes i wuld do it, and i would put a poison that is an instant death and put only enough to kill the ppl in china, they cause too much polution and there r alot of them( not trying to be racist against chinese)
that wuld be nice, but sorry its completely up to u and u alredy know my opinion, just wait around for someone elses opinion and im sure ull get what ur looking for
its a great thing if u do. but if i was u(even tho it makes me sad to hear about her condition) i wouldnt do it becuz of the expenses. if i could get her arthritis medicine and vet visits free i wuld do it but otherwise i wouldnt