I think the photos could benefit from being touched up. Touch up the skin a little. You could bring in more light into her eyes and around her eyes and into her face lines. The flyaway hairs on her face could be cloned out. I would take out the yellow from her teeth too.
As for the content, I like 2 and 3 better than the first and last. The first and last in an unconventional expression but for me (someone who doesn't know her or you), it doesn't do much for me. But 2 and 3 are nice captures and it is apparent that the picture taker (you) and the subject have a warm connection. Again, I would touch up these photo and in particular get more light (emphasis) on the focus points of the photos, like the eyes, and take down the distracting elements. I would try cropping #3 a little tighter too, it feels like there is too much air around her and some of her warmth is lost by that space.