Alright, so normally this would be awesome, my kid wants to pick up all of her toys, however...

LO has recently been picking up all of her stuff when she is done, and making sure nothing is left out of place. The other night she tucked my younger LO in with me and we were just about to shut the door and she started crying because her sisters room wasn't picked up. I let her go back in and put her sisters toys on the book shelf. This evening she wanted me to help her put the rest of the toys away in the playroom. Does this sound like something that is just a phase or something normal that a 3 year old would want to do? I just worry because I don't want it to become some OCD type thing, I mean she is pretty particular as is. On that note, I myself am a pretty neat person, I like to pick things up before moving onto something else but I hope that isn't rubbing off on her in a negative way. Again, I think it's great she wants to pick things up but they way she acts about it makes me a little nervous. Can anyone relate?