Logically, I think it is the mom. But...you know the grammatical arrangement is confusing.
Context:
There's the foxy Oscar nominee who shimmies down red carpets in stunning Giambattista Valli and Lanvin gowns. And then there's the mom of Aviana, 2, who arrives for an interview in jeans and Converse sneakers, her auburn hair pulled back in a messy knot.