I love a good angsty story where Natasha is ignoring daughter for Peter, Morgan, etc. Not really realizing it and reader is going through some mental health issues and if you don’t mind writing trigger warnings you you can go more into readers mental health issues and eventually Natasha finds out but at that point daughter needs to be hospitalized. If you do mind writing trigger warnings you can have reader run away in the middle of winter and by the time she’s found she is hypothermic and also needs to be hospitalized. In both instances Natasha realizes her mistake and feels really bad about it and then comfort daughter in the hospital