Rift (Spider-Man fanfic)

Used to her quite life in Queens, Diana's life takes an unexpected turn when she enters a world she only knew as the MCU. Suddenly surrounded by superheroes and villains, she needs to find a way to navigate back to her own universe. She gets the help of Earth's Mightiest heroes on her quest, but a certain Spider boy makes her realize she might not want to leave...

Marvel/Spider-Man fanfic
Tom Holland's Spider-Man
For the sake of the story, all of the Avengers are alive and on good terms.