I just read that and am perplexed by the timing; the cops were there and the house was empty. Also, weren't we operating under the assumption that Kim went to Kroger and made the first 911 call from there? Was that our assumption or did she say that? Or, perhaps the answer doesn't matter terribly since she's lied about so many other things.
The first call at 12:53 Kim, pretending to be a passer-by, called 911 to report racial slurs.
The second call at 1:22 was made from Kroger's.