* Seeking help: Though feral cats are often wary of humans, they might be driven by instinct to seek help in a time of distress. She may have sensed you were a source of safety or hoped you could do something to help her kitten.
* Protection: She might have felt the need to protect her kitten's body from predators or the elements, and believed your door offered some kind of shelter.
* Mourning: Cats are known to exhibit mourning behaviors, and this could be her way of processing the loss. Bringing the kitten to you might be a way of seeking comfort or acknowledging its death.
* Territorial marking: Some animals use dead bodies to mark territory, though this is less likely with cats.
Important: Regardless of the reason, it's important to be compassionate and respectful towards the cat. If the kitten is still present, you can call a local animal shelter or rescue organization for help.