In the context of talking about bed linen? I don't think so.
She used the wrong word and probably did a little cringe inside when she realised it. It's not a crime obviously, but I think Anna forgets who her audience is. Lets face it, mrs velour tracksuit with spag bol stain on crotch sat on the sofa eating crisps isn't going to know what anathema means anyway, so why bother using it?
Have you been looking through my windows?