I think you did a fine job, and provided her just what she needed.
To take these to a higher level, here are my suggestions. On 1 and 2, you can see the main light source is to her right (our left). I would want to use that light source, so I would either turn her into it, or away from it. Look at the light on her nose. It's really bright on one side, not so much on the other. You typically want to avoid that. On the closeup, shot #1, you can see that her eyes are a bit dark, and that's because she's not facing into the brighter light source. You have really great natural light there. I would have used it.
On three, against the white wall, another sign of a higher level shot is not having shadows unless you want them/they serve a purpose. A white wall is a great backdrop, esp for a headshot. But have her step away from the wall so the shadow doesn't show up. It's not unusual for us to have the subject 5, 6, or even 8 feet or more away from the backdrop.
Shot #4 is really nice! I still think the main light source is to her right (our left) as her hair on that side is much brighter. If it's direct sunlight, which I don't think it is in this case, I'd turn them away from the sun. But in this case, it looks like indirect light, which is really soft and flattering. I would have turned her into the light. Looks like you used your flash here with some kind of modifier because the light is soft. If that's right, you did a really good job of matching the flash with the ambient light. If it is just natural light, you did a great job facing her into it. The fact that I'm not entirely certain if it's a flash or natural light means you did a really good job either way.