No thyroid problems here, but I'm sure Layla will be just fine.
Since there has been some questions about her thyroid lately, I would go ahead and do the bloodwork. She should have her thyroid checked yearly in a couple years anyway really.
Homecooking is not easy. We started out with an unbalanced diet too. Thankfully I think it was corrected in time, but sometimes I get upset with myself over that. Live and learn... You were trusting your nutritionist anyway, so you did what you thought was right. No reason to be gulty...