Well, You have to look at it like this.
They could live a nice better life with a better Meaowmy somewhere else, But Lets Remember, She brought these cats in from outside, So.... I belive she should start a adoption agency and get rid of them down to a maximum of 10.
- They wont freeze to death
- They will get food
- They will get loved (Maybe as not as a personal Meowmy but its better than being alone on the street)
- Cats need to be loved (Yes, But on the street is not loved)
- It could become dangerous to there health (True, But its still worse outside)
-They need more room ( Food, Shelter, Warmth Vs Room?)
Think about it, If shes just hoarding them because shes nuts and not willing to give them up than
TAKE THEM AWAY FROM HER! but, If shes taking care of them, and is willing to depart from them to give them a meowmy its not as bad as you think.