What is the test for determining a parenting arrangement between parents of a 3-year-old girl and her mother?

As emphasized in Gordon v. Goertz, I must do a “full and sensitive inquiry” into Abbi’s best interests. In my view, this means my determination must go far beyond treating this case as a simple breach of contract exercise between her parents. This is particularly so since Abbi, the child at the focus of my inquiry, is not a party to what her parents may have contracted with each other several years ago. Thus, while I can accept that when Abbi was three, her parents both felt it was in her best interests that, if one parent got posted to another province, the other parent would “make every reasonable effort to obtain a posting in the same geographic area”, this does not now tie my hands in determining what parenting arrangement is ultimately currently in her best interests.