I’ve not seen any sunburnt g3s before, I believe most of them (thankfully) just fade. I have a bow tie with no pink left on her symbols, eyes or hoof heart and she’s only slightly more yellow than my others, if at all!
Can her head turn? For some reason the later white g3s all seem to be prone to random yellow patches and I’m wondering if this is what your pony may have? I’ll put a picture of my Fun Fairy below, it’s around her neck, a huge yellowed patch. She’s mint and unplayed with but still has the yellowing! My strawberry surprise also has it, although it’s all over her body!
If your pony is a later one 2006 or after, has the mark somewhere around her neck (it could be aged glue), and doesn’t otherwise look faded then I’d say it’s a weird ageing/batch problem!
Here’s fun fairy, both of mine have the same problem in the same place
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Sunsparkle
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