You can whiten your girl in two steps

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For pictures with very dirty faces, the way to beautify them is to directly select blur, and then brighten the color. One whitening can cover up all the ugliness. Blurring and whitening is the best combination.
Original picture

final effect

1. Open the original image and press Ctrl + J to copy one layer, select the menu: Filter > Blur > Gaussian Blur value is 8, then add a mask, use the brush tool to erase the eyes, mouth, nose, hair and other places, the effect is as follows picture

2. Create a new layer and press Ctrl + Shift + Alt + E to stamp the layer, press Ctrl + L to adjust the levels, set the parameters as shown below, and then use the Dodge tool appropriately to highlight the dark spots on the face to complete. Final effect.