U2 - that was one of the photos taken over the summer just after her FIL died, while she didn't have her arms out last night, she did look like she'd regained weight on her face. On last night's X factor, she didn't look very underweight, she looked healthy.
But the point I can't help many are missing, she has talked openly about losing weight after family death on her DH's side and another family crisis on the back of that on her side, and yet the narrative on here is that she's chosing her underweight bodyshape, she'd deliberately 'starving herself' to look thin for attention/her career/to look more attractive, and therefore is a poor role model. Yet if someone in the public eye gains weight, no one assumes they are chosing that body shape - particularly if they are known to be going through a bad time.
We all accept stories like "I'd been on a diet and looked great, but then I had a stressful time and it just piled back on" because so many woman do respond to stress by comfort eating, they are given sympathy and it's understood it's hard to control your diet when you are emotionally struggling/stressed. Yet woman who's natural reaction to stress is to lose their appetite are judged much more harshly, that they should be able to control their eating and still eat in a healthy fashion, so it's a choice to be thin.
That when her life has calmed down a little, she's regained weight, suggests that Cheryl didn't set out to be that thin.