A (German, I think) woman who is the daughter of a woman Natasha killed gets all of her information after her secrets have been revealed post-CA:TWS and tries to get her revenge. She shoots Natasha and thinks she's killed her, but then we switch to Natasha's POV and see that she has survived--although the woman has also blown up Clint's place, which is what makes Natasha angrier than the attempt on her life. We switch back to the woman and her family, and Natasha has found them and given her daughter something to distract her (I want to say a lollipop or a jump rope, but I can't be sure). The woman is terrified that Natasha is going to kill them, but she just talks to her, and the woman realizes that Natasha had a similar childhood to her own, and she could have ended up much different. I believe the story ends with Natasha back with the other Avengers.
If someone can help me find this story I will be so grateful, this has been bugging me for weeks.