Strange toddler behavior- obsessing about stories and needing things to be sung to her?

My daughter will be 3 in June. She’s very bright and curious, but for the past few months she will harp on something and ask to be told a story about it over and over again along with songs about it too. An example from today: I left something that we both put together out on our driveway for neighbor to pick up, but the garbage men picked it up thinking it was garbage. I told her that I was upset because of what happened since she asked what was wrong. I had to repeat the story about 10x throughout the day (about me putting the bag of things outside, that the garbage men picked it up and took it to the dump, that I had to go back out and buy the items again so I can leave them out for neighbors tomorrow). She then asks my husband to ‘sing’ her a song about it where he basically tells the same story, but as a song. She asks for songs more often than the stories. By the end of the day, she’s singing the song about whatever she decided to harp on that day. She’ll want to hear the story for the next few day’s as well and then something else will come along and the cycle starts all over again. Other examples are when she overheard that her cousin accidentally ate chapstick or she saw a worried expression on a character in a book. We have to make up a story to explain it to her. Is this just how she processes things that might upset her? Could this be OCD so young? She hasn’t had any trauma in life, she’s a happy and goofy kid. I’m just not sure if this is something I need to bring up with a doctor or just a quirky trait of hers. Anyone else have a child that does something similar?