Nidovirus (more likely in a python than IBD) can't entirely be ruled out just because, as pointed out, it can be dormant for years. However, 11 years is a long time and you haven't had contact with other snakes. I would never be so overconfident as to say you can rule it out but I feel pretty confident in saying I think it is unlikely. But that still leaves that grey area of uncertainty.
Should you decide to test, I strongly recommend getting a kit from Fishhead Diagnostics: https://fishheaddiagnostics.myshopif...us-testing-kit
For technical reasons I won't bother with here, they are a very reliable lab for this test and I would use them over and above other options even though they are more expensive. I think it's $75 for the kit plus shipping. Swabbing the snake for the test sample is not hard. If you do test, it'd be best to repeat the test in 3-6 months.
Also, if you test - before you swab her for the sample, stress her a little. Don't terrify her of course, but take her for a car ride or something. If a snake is positive they are far more likely to shed the virus, and thus have the virus be detected, after being stressed.
Personally, my alarm bells about Nido aren't going off with what I'm seeing and hearing about your snake - but there's no doubt that it is a tricky and horrid virus so testing is never a bad idea.
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