Null and Void — Susan Copperfield

Born without magic, Mackenzie Little has few prospects. In a futile attempt to break her out of the null caste, her mother ropes her into participating in a charity auction, where anything can be bought with enough money. 

She never expected her ex-boss would buy her company, but for one day, she lives a fairy tale.

Nine months later, despite their precautions, Mackenzie's little miracle is born.

Armed with Texas pride and New York viciousness, Mackenzie must fight through hell or high water to protect her family of two from a society obsessed with the magic they lack.