I think I would go for a multi-pronged strategy.
1. Your husband has suggested keeping her out of the kitchen. I agree. Delegate that job to him.
2. If that fails , and she starts giving unnecessary advice or trying to touch the oven or turkey, smile and say "Thanks, but I've got it covered. I've got to know this oven pretty well and I've checked all the weights, times and temps, so I'm fine.
3. If she continues, I would repeat this but add Bloo's suggestion
"Now you're not deliberately TRYING to sabotage my cooking, are you? Because if you remember (last year) and (year before)...well it's just so odd since you're such an awesome cook!"
you could also take her 'side' off her when she arrives, ask if it needs anything further doing to it and then say firmly "Thank you so much. I'll call you when it's time to [put it in to warm up / dress it / turn it out and decorate it / whatever she says will need doing] until then, do go through and sit down / have some of the nibbles"
If she tries to come back into the kitchen treat is as an offer to help and pre-emptively refuse "Oh, so kind of you to come to see if I need any help, but I'm fine. You go on enjoying yourself. I'll let you know if I need any help!"