First off,
It doesn't sound like this is your first snake? Either that, or you actually did "your homework" before acquiring her?Good questions.
While it's possibly an issue with parasites (when a snake is "always hungry" & fails to grow), it's also likely that you're expectations are too high: I'm assuming this is a young snake, & honestly, it can seem like "forever" before their growth is obvious. In part, this is due to the difficulty in measuring a snake- the tiny increments in length make it appear that their body hasn't gained any weight, when it actually has, albeit slowly. That's why many keepers buy an accurate digital scale to weigh their snakes to check their progress. 4 months isn't much time to see any growth in a young snake though- it's a bit like watching & waiting for water to boil.
Also keep in mind that young snakes are also eating young prey, which doesn't put weight on them as fast as when both the snake & the prey are more "mature". Younger rodents are more "digestible", but it sounds as if you're feeding the right size. Her appetite is so good that it probably is a good chance to switch her to rats (of the appropriate size)- some snakes switch easily, but others not so much- you won't know until you try it.
If you still suspect there is an issue with parasites (can't rule it out at this point), you can always take a fresh stool sample to your vet. If you don't already, you'll want to find a vet that has experience with "herps", since their medical care is quite different from warm blooded pets (cats & dogs, etc). To that end, this site may be of help:
https://arav.site-ym.com/search/custom.asp?id=3661
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