She'll have to make do with an old rail yard, she thinks, being as it's at least not likely to catch fire should she need to start hammering things - though it's horribly insecure. She just doesn't have time to search for proper privacy. Not if she wants to get this done today.
Really, though, this isn't going to require much novel thought from her, just a farming ritual wildly misused; she's going to need some extra seed oil to get all this rust off. (Not for necessarily this blade, but certainly for every future knife to pass through her hands.)
It's a simple job to immerse the blade in blade oil, then use a careful modulation of pulsing Force, imbued into the blade underneath, to get the rust off. If this - cleaver, yes - had taken battle scars and been allowed to rust for this long, it would be pitted as deep as the spires are tall - but it hadn't, despite being quite firmly rusted all over, which was why she picked this particular item. It didn't require an improvised forge to fix up properly.
After removing the blade from the rust bath, all that remains is a bit of whetting.