She's not uploading screenshots. This picture was originally posted on the official Twitter account for The Girls Live, so it still qualifies for the picture board
the screenshots on twitter are 1200x750 and still look better than the upscaled ones (which are not from twitter, because its not interlaced on twitter) https://pbs.twimg.co...E_2VQAA8spf.jpg
The picture is the same exact one that was officially uploaded on Twitter, just downloaded and re-uploaded onto the picture board, so it's not a screenshot. The reason it's bigger is because there is an option on Twitter to save picture files in a larger size.