Real Estate Law
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Thank you for your question.
It sounds like she can sue the inspector for negligence and/or fraud, and may be able to sue the seller and seller's agent for fraud for failing to disclose material information that was known to them, but the fraud claim will depend on what the terms of the sale were. She needs a local attorney to go over the paperwork and the facts and then advise her of her remedies.
She can get a free consultation from some of the Texas real estate attorneys listed by location here.
I hope this information is helpful.