The issue is using the wrong light metering mode for the lighting situation. Your D3100 has 3 light metering modes you can choose from.
Spot metering would have been appropriate. You use the spot (about 2% of the entire scene, and concurrent with the selected focus point) to meter the highlights on her facial mask - her forehead, cheeks, nose, and chin.
I suspect your camera was in Matrix metering mode, which averages the light in the entire scene, for both shots (the second is somewhat under exposed) and her black hair and the dark foliage in the background of the first shot biased the exposure.
Study pages 79-82 of the D3100 users manual (on the software disc that came with the camera as a PDF file) or download the users manual PDF file here -
https://support.nikonusa.com/app/an...2LzEvdGltZS8xMzgwOTIxNTI1L3NpZC9XYWlLTlpCbA==
As mentioned the bright ares of her face have zero detail because each of the 3 RGB color channels is max'd out at 255 (pure white).
On those parts of her face that have one or 2 of the channels at less than 255, some detail could be recovered using ACR if you have a Raw file of the image.
If all you have is a JPEG the image cannot be saved.
But even if you have a Raw fie, the best fix is to re-shoot and get the exposure correct in the camera.