One of the portraiture tools such as Portrait Professional. Go easy on the skin smoothing tools though, it's very easy to overdo it with those. Just do a small amount of reshaping. Unless you're skilled and experienced, those tools will likely do it faster and cleaner than you'll be able to with liquify/warp in Photoshop.
I very, very rarely do any adjustments to facial structure, but a few months ago I had a client that required it. It was one of those medspa-salons where they do botox and face peels and body wraps and stuff.. they were so critical of their own portraits. "I look so fat, look at my horrible dimples, look at my jowls, I hate the way I look in pictures." I figured, they're in the business of fabricating artificial beauty, so I had to set aside my qualms about using software trickery on portraits.
I used a tiny amount of the face-slimming and neck-lengthening tools, and those seemed to do the trick. I turned off all the other features like the skin smoothing and teeth whitening; those usually go too over-the-top for my taste and style.
Alternative 1) Perhaps short-lighting or broad-lighting would have made a difference, instead of the almost-flat wrap lighting that you used. Since she's worried about the width of her cheeks, maybe short-lighting would have worked.
Alternative 2) I often like to go through a range of facial expressions. Big smile, gentle smile, Mona Lisa smile, completely neutral, wide eyes. If the mood permits, throw in a few fun and wacky ones, like an exaggerated wink, a big surprise face with "O" mouth, a toothy snarl, a pout, etc.
Below are the raw, unedited photos.
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