Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
You say you were singled out, you mean that other persons who were under 40 have errors and are not being disciplined and if that is the case, then you would have a claim of discrimination
based on your age. You would have to prove that the ONLY reason that you are being punished or selected for inspection would be your age and no other reason. If this is the case, then you must file a complaint for age discrimination with the EEOC
(http://www.eeoc.gov) and they would have to investigate and examine your evidence to determine if you have a right to sue and issue you a right to sue letter.
Wanting newer nurses (or other types of employees) for less pay is not age discrimination according to the US Department of Labor
and the EEOC, it is a economic discrimination that is not unlawful. So if the reason they are doing this is economic, then that would not fall under age discrimination even if it may impact workers over 40.
Gender discrimination is another matter. Again, you have to prove the ONLY reason they are doing this to you is your gender. There can be no other reasons (aside from maybe age/race/national origin/disability) for their conduct towards you.
Any evidence of discrimination on any one or multiple of those grounds you need to file a complaint to the EEOC to seek a right to sue letter.
If she is making known false statements about you, such as stealing drugs
, that is yet another issue and grounds for you to sue her for defamation per se, because it is a tort to accuse someone falsely of drug use or abuse or even theft and you can seek damages against her personally for doing so.