These are very fact specific cases as "normal wear and tear" is going to depend on exactly what she is claiming needs repair, and the specific cause of the condition. A landlord cannot claim normal wear and tear as "damage" but a tenant cannot claim damage as normal wear and tear.
Under the Texas Property Code she may be presumed to be in bad faith, but she can rebut that presumption with evidence that she did not act in bad faith. Again, the specific facts of your case are important in determining whether she has violated the law and, if so, what your damages may be, if any.
You will need to consult with an attorney so that he/she can inquire as to all of the relevant facts of your situation.Ask a similar question