I don't know what her exact relationship is with Moda, but it is very likely she hasn't "sold" her designs to Moda, but gets a % of sales. So, any knock-offs would be stealing directly from her pocket.
True enough, Walmart wouldn't do this on purpose. It's the manufacturer of the fabric that will be in big trouble here. Anyone know if it's Cranston or?? The designer and her lawyers are going to make some money off of this, to be sure. Which she deserves.