The words "all right" are an informal way of saying "indeed" or "truly."
You could say, "That's a fast horse, all right" to say that you believe that it's a very fast horse. (It's best with a comma as I've shown it.)
The phrase is unusual in written form, but common in informal spoken English.
So as the others here have explained, she really knew how to enjoy life.
This usage suggests there might be a bit of a disapproval in the speaker; it would be said with a raised eyebrow, and would imply there was a great deal more to be said than would be polite to describe.