OP, I'd bet I'm twice the sniny-fanged rabid old-line feminist your professor is, and call me "Ms Said" if we're not on a first-name basis thankyouverymuch, and you know what? If someone wants to be called "Mrs. Whoozits" that's what I call her. I think Miss Manners has it right on this one.
I think Miss Manners has it right on many things, come to think of it. In some interesting ways, she's quite the radical herself.
I do find it useful to filter out anyone who calls here asking for "Mrs. DH" because DH and I have both kept our original surnames. If I'm grouchy enough, I assume the call is for my late MIL* and inform the caller that she passed away some years ago. Generally, I just say "No thanks" and hang up.
(*She was the only person allowed to call me "Mrs. DH" and used that privilege only when Miss Manners would have approved, btw; when she gave us monogrammed gifts, mine had my "maiden" monogram or my real-world daily use-name. My own mother would've been allowed to call me whatever she liked of course, but she knew my preferences and kept to them. She did use my childhood diminutive, but hey; see previous sentence. She also called me "Mrs. Murphy" sometimes, a joke that nobody but her, me, and my late dad got.)
Recently, because incomes are shrinking, we downscaled our joint ("Family"?) membership in a beloved science/conservation group to a single membership, with guest privileges. We got a wallet card (and I just got confirmation email;) for Myfirstname Hislastname, which will just confuse everyone. The renewal check was from a joint bank account in both our names. His name is first on the check because I high-handedly decided they should be in alphabetical order. I'm still not sure how the org came up with the result.
We're both laughing at it, anyway. He's been called "Mr. Mylastname" a few times over the years... Eventually, you just have to laugh.
OP, I'd go with the recommendation that you make the stipulation that some PPs have mentioned on anything you have to hand your professor, reminding her of Mrs. Donor's preference. Might set her teeth on edge; might set my teeth on edge; too dingdangity bad—it's not her name or mine.