I feel like more context is required for AG's alleged statements to the police. I can imagine a tired, frustrated, sarcastic "Sure, whatever, that's right -- I killed him and I'm delighted to be free and now I'm off to spend the insurance money!" (sic).
Odd as that sounds, it makes more sense to me than someone who is ostensibly home-free after a successful murder suddenly confessing to the police who up to then have regarded her only as a bereaved victim. The alleged confession has been cited as evidence of her cold, murderous nature, but what coldblooded killer gives it up so easily and for no apparent reason at all?
best,
s