Is this fair of my teacher to ask this?

Okay, so I took a course this semester that is technically my university's upper division English requirement; the idea is that it's a course taught in your major to teach you how to write based in the major.(my major is Japanese, but all the foreign languages are clumped together into one class.) So our class was in the Foreign Languages department, and it was taught by a French prof, who based the course around the study of fairy tales from different cultures. Recently, we had to find a peer-reviewed article discussing a certain fairy tale or a specific culture and write a 300-word review of it. Here's the exact instructions copied from the syllabus:

Find a scholarly article (via the school database for instance) related to folktales/fairy tales about a specific country/geographical area studied this semester, or about a specific tale (read for the class or not). For example, you could find an article about the French version of Little Riding Hood; or about the history of the Chinese folktales, or about specific storyteller such as the Grimm Brothers in Germany. Write a critical review of this article (a short summary of the article, then an analysis of the argument of the author). You cannot use the articles read for the class for your critique (300 words).

So I searched on the database and found the dissertation (271 pages, including acknowledgements, introduction, etc.) written by one of my Japanese professors about the tale of Urashima Tarou, addressing the essential problems with the tale and relating the history and background of it. It was a very interesting thesis, and I naturally assumed that since I found it via the database, I was allowed to use it for my assignment. So I wrote a review (around 400 words) of the article, following all of the instructions the teacher gave to us (you needed to summarize it in one or two sentences and state the author's point of view and then review it, etc.) and submitted it right on time. She also wanted us to e-mail her the link to the article, and I did that, as well.

In all of her instructions, she never told us that we couldn't use a dissertation. We turned in the assignment this Tuesday, and yesterday, she e-mailed me and asked me to re-do the assignment because I had reviewed the wrong type of material, even though the reason I used the dissertation was because I couldn't find any other good articles. (I tried searching for articles about several different fairy tales and couldn't find anything else that was within the perimeters for the assignment.) She also didn't provide us with very clear instructions concerning this. (this isn't the first time she's done this, either. A few weeks ago, she wanted us to rewrite a fairy tale, basing it in a certain culture and time period, and make it at least four pages. I rewrote Sleeping Beauty in Edo period Japan, and it turned out to be nine pages. It was due today, but I turned it in last week and she rejected it, saying that it couldn't be more than six pages, even though she never stated a maximum when she gave us the instructions for the assignment, either verbally or on the syllabus.) I ended up rewriting the fairy tale, but because I had to cut so much out of it, my story turned into a big pile of mush.

Right now, I'm basically hating on her for giving us misinformation about our assignments and then changing her mind after they're submitted. I've been e-mailing her and trying to convince her that she shouldn't make me redo it because I followed all of her instructions, but she seems stuck on the fact that I used a dissertation instead of a shorter article and won't budge from her mindset. I think it's especially unfair because I've already had to rewrite my last paper to follow guidelines that she didn't tell us about until after I turned it in, and I feel like it's the same thing this time.

It's not like I'm not already doing well in her class; I've been getting "A"s on all my assignments so far, and if she just took off five or so points for this misunderstanding, I wouldn't care at all. But I think it's very unfair to make me have to redo this when final exams start next week and everyone's busy studying for them.

Sorry for making this so long, but I'm just really frustrated with her. We also didn't do teacher evaluations for this class, which we're supposed to do for every single class at the end of the semester, and I couldn't let her know that she was very vague with instructions and needed to give more information about what sorts of stuff she's looking for when she teaches this class in the future.

Is it fair for her to ask me to redo this assignment, given that it's so late in the semester and she didn't give us specific instructions regarding it?