Shoot with a high-quality lens on a modern, full-frame camera (this looks like Canon to me) in open shade or against the light, so that the light on the face is very flat, and low in contrast. Then process the daylights out of the resulting flat-lighted images.
Look at her face in the first few shots: the light is utterly flat, zero lighting ratio, because of shooting in open shade, and then processing the flat light heavily. There is no modeling or shaping to her facial features..the shadows are very,very open,and exist in very small amounts. In the backlighted stuff, shot against the sunlight, the foreground is providing some natural fill-in light, and the exposure in the highlights is totally,totally blown...but it's not that noticeable because the shadow-side exposure is solid, and the processing looks appropriate.
It might sound like I am knocking this style, as words like "flat light" and "process the daylights out of" can be assumed to have negative connotations, but this is actually pretty simple: the photographer has sought out the kind of light that allows for the kind of processing the images will be given. The flatter the light at the time the shots are made, the easier it is to crank up the post-processing. This is basically shooting as much as possible, in low-ratio, even lighting.
If the photographer had shot in say, dappled sunlight that hit her face, the way many beginners will do, this set would be anightmare. Instead, it's ALL shot in open shade, white balanced warmer, and juiced up in post. Keeping the highlights from blowing out is not really a concern; the hair is detail-free in some spots, yeah, but...we're looking at her face, which was exposed right for the kind of post processing he had in mind!