A woman named Sabrina Morrissey -- who says she's acting in her capacity as temporary guardian of W.W.H. (presumably Wendy Williams Hunter) -- just filed suit against A&E Television Networks, but she did it under seal ... meaning the public can't peep what exactly she's running to court for.

In the docs, obtained by TMZ, there are a few clues that could indicate what this might be about ... and all signs seem to point to some connection with the 'Where is Wendy Williams' 2-part doc that's dropping Saturday.

Morrissey is also seeking a temporary restraining order in her action -- again, that's often the mechanism used when someone wants a judge to step in and halt the release of a film or television project. Considering the doc's release date is just a couple days away ... that would make sense, although it's impossible to tell for sure with the docs being under seal.

Now, what's interesting in the docs here is that the judge actually ordered all the docs to remain temporarily under seal -- and set a hearing date for next week to determine whether they should stay that way as the case plays out.

Of course, the Wendy doc drops this weekend ... and while the hearing on the sealing issue falls after the release date -- it's possible the court will rule on the merits of what Morrissey's asking for ... namely, injunctive relief against A&E -- while the docs are temporarily sealed. No word yet on a ruling on that front.