Brian, off the record/tape you pointed Wanda to these "arms" and told her they looked fat, she agreed and now that's what she sees.

So now she sees "fat arms" and that means to her that this person must be obese and so now "it looks just like her"... that's some logic,
but she has no idea what she's looking at and how distorted it is from reality, that strange episode comes before your focus on the "too pretty" face.
You claim to have the same problem, you cannot seperate thea above image from reality but there should be a simple way to snap you out of it.
Search the entire internet and find an arm that looks anything like that mess.
Again, Wanda saw a "fat arm" and she makes an assumption that the entire person must be fat, that's it, from small acorns grow...
There's nothing else. From one fat arm she thus concludes "it could be her"
but the face is not, since it's "too pretty" and the rest from Rosa.
Is that full and honest enough for you?