Supergirl lives in the city in a normal apartment with a flatmate/girlfriend she met during highschool. They have been living together ever since. Diana knows about supergirls identity. She figured it out while they were still in school. She saved her from bullies using her superpowers. Diana kept her secret ever since. Supergil can come and go without changing her costume.
The rent is due.
Supergirl has her half but Diana recklessly spent hers expecting supergirl to cover for her... again. She is not having it. She is furious. She takes her frustration on poor Diana by breaking her...

Supergirl lives in the city in a normal apartment with a flatmate/girlfriend she met during highschool. They have been living together ever since. Diana knows about supergirls identity. She figured it out while they were still in school. She saved her from bullies using her superpowers. Diana kept her secret ever since. Supergil can come and go without changing her costume.
The rent is due.
Supergirl has her half but Diana recklessly spent hers expecting supergirl to cover for her... again. She is not having it. She is furious. She takes her frustration on poor Diana by breaking her arm, fingers, dislocating her shoulders, legs until she agrees to come up with the money.