What was she doing on the street? (Possible spoilers)
This woman was an emotional basket case, immature and incapable of good decision-making. From the very first moment we see her, she's behaving badly, pouting over the (completely unrealistic) partnering with her father in the squad car. He TELLS HER to wait for backup and she charges out after this kid, who she treats as if she knows him--and what was she doing with an unsecured weapon, anyway? It was probably a good thing that she was removed from active duty, since she was just one more bad decision away from executing someone in a fit of pique.
Her bad decisions didn't end there, of course. We see her:
1) Chewing out a kid on a 911 call, resulting in his death
2) Using pills during her shift
3) Drinking to the point of sickness after her shift (After taking painkillers!)
4) Failing to use her leg brace to answer the door
5) Attempting to influence the investigation of her case
6) Throwing away her cane because her feelings were hurt
7) Putting her father's friend's career at risk on at least two occasions
8) Asking another officer to investigate an open case already being investigated
9) Stealing ("recovering") evidence at gunpoint . . .
I gave up on this dog of a movie. She deserved to be arrested and prosecuted for her actions, which were getting people hurt or killed at seemingly every turn.