It was in response to all the public backlash. It was what local prosecutor had to do to placate to the masses because she stupidly posted it for everyone to see. Animal cruelty was definitely a stretch because they were abandoned animals (many in that litter had parvo so their time was likely limited anyway). I'm guessing that's the interpretation of the law that fit best such that the county attorney could draft a plea deal and basically result in a zero sum game. It'll all disappear in 6 months. A temporary dummy tax so to speak that will keep her out of the forest with a gun for spring bear season.
Unfortunately, the "sentence" has already caused a bunch of rumbling online so I'm sure she'll be harassed until the internet animal warriors get bored.