"Kim stated she went to the Kroger's looking for an "off duty cop".. But she had to drive past a police substation to get there. (according to our local posters) If she wanted to drop her off with the cops, why not go to the substation?"
Now, THAT I find intriguing. Excellent question.
Because she had an active warrant for her arrest. She would have sought an environement with only one or two cops on the scene rather than run the risk of bumping into somebody who recognized her. Police departments in large cities are active places night and day, with many officers coming and going and hanging around, writing reports, etc..
There is a police substation in Northgate Mall at the north end of N. Buchanan Blvd. This is the same mall involved in Elmo's case. But it's really not on the way to Krogers which is more to the west. But if Kim were looking for the cops she certainly could have easily found them.