That raises a few issues. Firstly, perhaps Ben from Dark Histories was slightly selective in which accounts of the attacks he used? He does state at the start of the podcast though that his references were the original French reports, rather than any bastardised and sensationalised second or third-hand accounts.
Next, your account reinforces the hypothesis that there was no single beast, but a series of attacks perpetrated by different animals. If the woman described the animal as a donkey, I suspect it
was a donkey. The following video shows how aggressive donkeys can be and states that they used to be kept to protect livestock from wolf or wild dog attacks. If a country woman, familiar with the local fauna says donkey, then I'm willing to believe her. Donkeys are, of course, herbivores and wouldn't kill for meat, but they sure as hell could cause some serious wounds, especially on a child. If the creature was rabid (rabies was widespread in continental Europe at the time) then it would act with enormous ferocity.
Attacks leagues apart on or around the same time throughout the Lozère region suggest strongly that an entire menagerie had become opportunist man-hunters. Wolves naturally, specially bred or inadvertent wolf-dog hybrids, wild boar and now I'll add at least one feral and possibly rabid donkey to the mix. I'm not saying that an ABC is completely impossible, just that Occam's razor demands we consider more plausible explanations, such as those proffered by the Dark Histories podcast.