Hopefully this and other important information will be disclosed in this young Lady's forthcoming book. I'm only seeing "Betty Cornell's Teenage Popularity Guide" listed as being out of print and unavailable at Amazon, and I'm seeing no listings for it at all at eBay.
I regret that I will be of limited assistance in this particular matter, as a stoat's face is covered with fur and as a result we rarely concern ourselves with things such as pimples as they are not visible.
There are a couple of copies on bookfinder.com (which searches bookdealers’ inventory lists including amazon.com).
They are at $39.99 and $121. But if you return to the site periodically, you may eventually find a copy for $10 or less.
There is often at least one deal with copies of ANY book at over $100. Sometimes also the same dealer inventory is listed through numerous services resulting in multiple hits “at that price”.
But often such books sell for far less.
You may also try google books or some similar service (maybe through archive.org) to see if the book has been scanned in online someplace.
There are two copies currently available at Abe Books.