Oh, I know! If you have a Michaels store, look at the yarn; if they still have the Caron Cakes in Macaroon, the palest green/yellow shade is a good match for Mimic, haha
My Mimic is faded, she's a childhood pony, but you can see the stripe beside the purple is pretty close!
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I have been able to find several different Caron Cakes but not in Macaroon.
Still have to check out the acrylic paints as Hobby Lobby to see if I can better match her than the Celery color found at Micheal's. With all the different pictures of her, it really seems that Mimic comes in a bit of variety of colors. Perhaps due to fading? Maybe there were variants from different runs of her?