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There is no way to eliminate the risk of a lawsuit typically, but you can increase the likelihood of success if you document the incidents involving this employee. It is best to have as much corroborating evidence as possible to prove she is not limited by her condition but taking advantage of the legal protection afforded by her pregnancy.
If she claims her condition is limiting her, then you should normally request a letter from her physician specifically addressing her work-related restrictions.
If you can accommodate any restrictions without incurring extreme cost, then the law would typically require that you provide such accommodations.
Good luck and take care.
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