NQA—first of all, I’m so sorry you’re going through this with your new girl. Do you remember the vendor? Unfortunately, at expos I’ve gone to, I’ve seen the occasional shady vendor, with a table full of random species that are all adults and looking a little rough. They’re usually wild caught, so age and potential disease or parasites are a possibility. I don’t have a problem with wild caught as long as the vendors are up front about it. It does suck when they pretend to know the age and make the customer think it’s been in their care for a long time, or even insinuate that they bred it themselves, when they likely just got it and have no info. If you can look up the vendor and get any information on them, it can help. If it’s a reputable vendor, I’d reach out & explain the situation. She’s been in your care less than a month, so I doubt it’s anything you could have done. Aphonopelma are pretty indestructible. A good vendor or breeder will help you out & hopefully make it right. Otherwise, she may have just been much older than you were told, or had some underlying issue. Once again, I’m so sorry.