Some points about your comments:
1- From her description, neither eligibility nor criminality has started.
@kattarrina correct me if I am wrong.
2- No matter criminality started or prolonged, her eligibility has not been assessed yet. These two are two complete separate stories. What they need to do in Calgary or Vancouver is to pick up your file and check your eligibility.
3- No criminality is different than security. They might put people in more advance security or the so-called SS for their origin (e.g. Middle East), but it starts after eligibility passes or (maybe recommended pass at least), which is not the case for you. Criminality looks more into criminal records, but security is the one that considers other aspects such as region. Plus, you think Serbia is slow, there are many countries in the world that don't have any diplomatic relationship with Canada at all, yet their application gets done normally.
4- your friends were just lucky that their files were picked early.
5- If there was anything wrong, you would be able to see in the notes section of your GCMS notes. They usually make clear statement of what the problem is (e.g POF). If there is nothing like that, then there is no problem at all to worry about.
Hope it helps
