It's actually a relief that she'll never get her thyroid checked, because if it's low all we'd ever hear about is how her "hasha-mottos" explains her obesity in spite of her lidurally eating shthoo hulthy and how it's impossible for her to lose weight no matter what.She should also get her thyroid checked, since low thyroid can cause hair loss.
She'd have to admit that to herself, but I'm pretty sure she already knows that's not true. She could go get it checked and just keep it to herself if she wanted, it's not like we could find out unless she tells us.