JJ in Super Mario: Multiverse Chaos

This was a birthday gift I made for my girlfriend! :) JJ has gone out for a walk around the park on a very beautiful day, until suddenly she gets sent to the world of Super Mario through a mysterious portal that appeared out of nowhere. But it's not just the typical world of Super Mario, it is also infested with a bunch of enemies from other games. Who would be responsible for this? Can you help …