Fellow school governor: I have witnessed first hand that communication from the head to me, a governor, is not what I consider it should be. It is therefore, not beyond the realms of possibility that communication with "lowly" school dinner ladies might not be what it should be. Instead of suggesting that we meet with them with a view to, in essence, invite them to leave because they chose to report an issue direct to Ofsted inspectors is not the best course of action, is it? I have suggested that we meet them to gently ask them why they did so, and I wouldn't be surprised if communication channels aren't what they should be, and possibly what the head imagines them to be.
The head is a fantastic head, teaching-wise, but needs help as an administrator, IMHO.