Have there been any other changes lately, in diet or environment? And was this a new groomer, or someone you trust?

And yes, some dogs do this when they are bored, but usually there's something else at issue.

For now, you may have to "cone of shame" her while that paw heals, as now it will feel itchy and sore since she's been licking it so much, and that's perpetuate the problem!