I am so sorry for your loss! If I were in your position I would disinfect what I can in the enclosure and let it sit for awhile before adding a new cham into it. But that is depending on how the disease was contagious. I agree with Beman to wait for more experienced cham owners to chime in!
I wish my mom was like that lol. She calls my boys lizards and is terrified to come in my room. But hey, it keeps her out so I mean its not that bad. Lolol your mom sounds so cool.