Thanks, Danik, you are very perceptive. I did read about the "spravka" and I asked my niece to request it, for when we are asked for it. I sent both applications together, and we had no "spravkas" on any of the checklists for any of the paperwork. Like I said, my niece sent a web form a month ago or so, sort of " how much longer, please?", and the response was that everything is good with the application, just wait.
So, yeah, she has the "spravka", electronically sent, but in the link it says that "originals only", and another small detail, I never knew we were going to be at the Warsaw VAC until I was approved as a sponsor and THEN the file was transferred to Warsaw. The link talks about "the Embassy" (?) The police certificate is also mentioned in the VAC specific Application forms, under Warsaw....
Geez, now I am more confused than ever.... Ironic, ain't it?