When Thor 'suggested' Katherine give her the grand tour, at the same time his niece pegged him with a vaguely horrified look, Sif looked at the side of his face with an exaggeratedly incredulous expression.
She adored him, but sometimes she had difficulty understanding how he had survived so long when he could at times be so completely dense.
But, even humbled and changed by his experiences on Midgard, Thor was who he was, and off he went, driven to distraction. Sif sighed through her nose, glancing back to Katherine only to find her having materialized elsewhere. That had the potential to be annoying.
"He really has no idea of women," she confided in the girl. An olive branch, of sorts.