I don't agree with everything she suggests, particularly about the lip color. Bold or especially dark colors will tend to make your lips appear thinner, which is the opposite of what you're going for here. There are plenty of YouTube tutorials for creating fuller lips of course.
I think that the most important thing she did here was shaping her eyebrows. You'll want a soft, rounded arch if you're aiming to soften and fill out your face. The chin contouring was really effective but may be more of an advanced technique.
You can also push a bit more roundness in your cheek contour and blush application if you want to. Just applying it in a soft curve will do a lot for you.
