Had a patient threaten to sue because their veneer shade was 'too white' (they picked it)

Patient came in for veneers. We did a shade selection, she approved the shade, signed the consent. Lab delivered exactly what we ordered. At delivery, she says "this is too white, I want it redone." I explain that she approved this shade. She threatens to sue, says I'm "unprofessional," and storms out. Now I'm worried about a lawsuit over something that was literally her choice. This is why I hate cosmetic cases.