She has no legitimate claim against you, based on the facts you've presented here.
1) Truth is always a defense in slander cases, so if what you're saying is true, you would be protected.
2) She does not have any damages from the information you've presented here.
3) It is unlikely any attorney would take her case, based on the information you've provided. Not enough damages to file a suit, and the content of the "slander" itself doesn't most likely rise to the level of legal slander.
4) You tell people that in your opinion a man has little honor if he calls a woman stupid. Go right on ahead.
It is not slander to state your opinion -- opinion is protected speech. Slander is when you communicate an untrue fact to a third party and it thereby damages the other person's reputation.
I agree with my colleagues; slander requires knowingly making a false statement of fact. In addition, truth is an absolute defense against slander.
The author of this answer is an Attorney-at-Law, licensed to practice law only in the state of Arizona. Unless both you and the author have signed a formal retainer agreement, you are not the author's client, and the author's discussion of issues does not constitute legal advice. Opinions expressed herein are solely those of the author, and are neither privileged nor confidential.
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