My sister-in-law pretends to be allergic to peanuts...

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My sister in law had an allergic reaction to "something" almost 20 years ago. The doctor said it was most likely the stage make-up that she had been wearing for a school play. She has never been tested for allergies, but swears that it's peanuts she is allergic to. And she really plays this up by using it to avoid foods or situations she doesn't like, and her family (her mother especially, as she still lives at home) totally buy into it. They kind of "tip-toe" around her, so to speak, and treat her like a helpless child, which only makes it worse. Whenever we go there to eat or have dinner where we are asked to bring something, my husband and I are read the riot act, and basically "told" what we are to make and bring. I'd love to bring pecan pie to our next dinner, but of course, "it may be peanut-contaminated", so that's a no. And if I did, I'd never hear the end of it. What do I do about this girl, and her bratty behaviour? I've even offered to pay for allergy testing for her, using the excuse "what if she's allergic to more than we know?" But still, she refuses. Should I just decline invitations to avoid the hassle, or is there something else I can do? What would you do?