My chinchilla is sick , what am I doing wrong ?

On April 13 my boyfriend got me a chinchilla when for my birthday , I've never had a chinchilla before only bunnies and hamsters. I read online that they have to stay from 60-70, I ordered an ac online portable, but it was going to come for a week and I checked the whether and figuer it was okay since it wasn't going to pass 73 . She was fine up until the 17 when when it got up to 80 and I was freaking out I was putting ice in Tupperware and kept changing her chinchiller, we finally got pass it and the same night I when to get a another ac at the store though. She was acting weird after that day and it sounded like she couldn't breath up to that point I immediately call to make an appointment with an exotic vet , he told she had an upper respiratory infection, my poor little baby got 2 shot and 7 days of medicine after 2 days later I went for a check up again and they told me whatever your doing keep it up because she much better (p.s the vet told me to keep her at 75 ) she was so much better up until yesterday, however she did have matted fur around her eyes . So yesterday she was fine she took a dust bath and I let out in my living room and she was just trying to get out of the playpen and it was 72 down stair I took her up stair because I felt like it was too hot and went up stairs I cleaned (vinegar/50 and completely dried it) and her cage all of it fixed it and she never wants to go under her house and I figured it's plastic and she feels hot ( I ordered a wooden house waiting for it ) and keep sleeping on top where her food and water were . I would cover up her cage when I would put the ac on but I felt like she was hot since it was 70 and I only left one cover but I think at night she knocked it down, (ac is not directly pointed at her) have her cage connected to her play pen and it's over and chinchilla proofed , I noticed that she didn't get out as much and I just thought she was tried because my mom has a day care center and I feels like she can't sleep that much , but I woke up to being in the corner of her cage and whimpering, I'm going to take her to the vet today but what am I doing wrong , I feel like my poor baby violet is suffering because of me ;(? What temp am I suppose to keep her at ? (By the way the temp on ac last night was 68)I love her so much can stop to think about how she suffering? Please help me out I don't want anything to happen to my poor baby ?:(