Tilly's licking her pee

Last week I saw her licking a warm pee spot in the carpet after her accident. We keep her gated in the master bath (it's small) with a piddle pad. She's only had two accidents in one week and it's probably from me sleeping in an extra hour. At any rate, this afternoon I let her outside and she peed in the grass. I gave her lots of praise. She turns around and starts licking the grass she just peed on.

What is that about?? Freckles did that towards the end when she was peeing blood. I thought it was the taste/smell of the blood that brought some sort of wild canine instinct.