Oh goody!
It mean "Oh God", or "Oh Good" ? Because option 2 is similar to my wife's answer when she leaves me alone with kid.
Even if I send her a photo of me covered in blood, the baby is crying, and the cat is eating some shit from the floor, and the curtains are burning.
" Oh goody. I'll arrive in a couple of hours. I want to buy that thing for bubbles in the bathroom".
Hahaha, it means oh good and it probably was because she was looking forward to me getting home with the oldest and swapping for the youngest!