Mary Slay sued Allstate Insurance Co., alleging it violated the implied covenant of good faith and fair dealing in her “exclusive agent agreement” when — relying on a portion of the contract that said Allstate “retains the right in its exclusive judgment to approve or disapprove” a sale of her customer accounts — it refused to approve a transfer of her book of business to her husband, Buddy, whose independent agency already sold insurance for Allstate.A Cook County judge granted Allstate …