Mom in law from hell!!

Me and hubby went on vacation and left our daughter at his moms. My daughter has been vegan since birth and she’s now 3. I packed a vegan lunch for every day that she’d be at her grandmas house. Long story short, when we came back from vacay, the meals were untouched. Mom in law response was “that baby needs some meat”. She fed my daughter pot roast, BBQ, and god knows what else. Hubby said he will handle it but its been a week, almost 2 and he hasn’t said anything. Should I address it myself??