I don't know this mold maker or this particular mold. In addition to quality control, my concern about some of these silicone mold makers on Etsy is that they are ripping off the designs of the reputable ones. Ask her, if she's willing to tell you, whether the silicone she uses has an acid base (which is fine) or an arsenic base (which is toxic). The quick drying silicones usually have arsenic and the arsenic will leach out. It's been a problem for people who use silicone fish-tank accessories and they can't figure out why all the fish die.
I am now experimenting with making my own molds and have taken several classes in the use of various silicone products. There are literally dozens of suppliers of silicone. Some of it is great quality. Some is awful. It really makes a difference in both how the mold looks/performs and how long it will last.
I would not use the molds you got at this point. If you've not yet shipped them back, you can try one other thing. Silicone requires circulating air to fully cure. If she is turning these around too quickly, that may be the problem. If you have a powerful fan, put it directly in front of the molds and blow it full force (in a separate room from where you are) for several hours and see if that helps. Washing/soaking/baking molds that are not fully cured will not usually solve the problem. Trust me - I've tried.
One more thing - check eBay to see if she has a store there. Most of the Taiwanese mold makers have businesses on eBay and will have hundreds/thousands of feedback comments. eBay is where I found my four most favorite silicone mold makers.
Connie
http://www.soaprhapsody.com