They are definitely standard so it does bring what the mom is into question. She looks double Rex but obviously that's is not the case, I have no idea how recessive hairless look tho. I really don't want to run out to the shed at 2am so hope you don't mind this bad picture from a few yours ago, you can still make out what the coat should look like at that age. I can try to find a similar aged baby for a pic tomorrow.
Maybe hold back a son and breed to mom and see if it hairless? Although I have no idea what else it could be.