4 months is a really long time to have an infected lung with no symptoms until now. I don't think it's fair to blame the pet store if you've had her for that long. Along with treatment it's really important to find out the actual cause of the illness and put it right. Otherwise you have no chance of curing her and giving her a happy healthy life. I truly hope she gets better, I love chams and have a huge soft spot for female veileds because I have one of my own. She's my first and although it's not been perfect I am proud to say that after six months I am doing all I can to keep her happy and healthy with everything I'v learned here on the forum.
You are getting another chameleon which people will advise against because you are having troubled with your first one. I understand you've done research but don't you think you should fix the first Cham up before possibly taking on more than you can handle? 2 sick chameleons will be time consuming and expensive!
And a kind word of advice from one noob to another is that these people know what they're talking about so listen and take heed or people may not be so generous with knowledge the next time you have a problem and want answers
People are not hating on you, they are simply giving you advice and are confused because you keep changing your story. The people that have responded to you in this way are the ones that have been keeping chams for a long time and can actually help you, the ones that are agreeing that you're being hated on are mostly new inexperienced members.
Sometimes the truth hurts and nobody here is tryin to hurt you! Just because you don't want to hear it doesn't mean people are being nasty. You've started a lot of threads with conflicting info so I can understand why you and the ones trying to help you are confused!