Me and my mom arrived in Germany at Frankfurt airport. We flew to Frankfurt from Skopje via Ljubljana. We passed passport control in Ljubljana, but in Frankfurt, we headed towards the baggage claim without passing passport control and without a passport stamp. She is an EU national, but I am not. Will passport control ask questions upon departure? I will be staying for one month. What should I do in this situation?
You arrived from Slovenia, which, like Germany, is in the Schengen area, a group of countries which have largely abolished border controls between each other. For the purpose of border control, you were effectively on a domestic flight.
You'll go through (exit) passport control when you leave the Schengen area. Here they'll check how long you've been in the Schengen area as a whole - which exact countries you've been isn't important.