Could you put the phrase in context? Where did you read/hear it?
The only context I can think of is if a chance circumstance occured, or something postive happened for the speaker that they had no influence over.. For example:
A: Mary gave birth to a beautiful little girl last week.
B: She's always wanted a girl.
A: Yes. How amazingly life obliged!
It's not a common saying, at least I have not heard it before.