Babbling Becomes Jargoning

I know that title sounds like a joke, but that really is what the child development books say is happening.  It seems that our girl is going through a sudden bout of the pre-talking known as jargoning.  How is it different than baby babbles?  It sounds a lot more like sentences since the baby is practicing the various inflections of the language they are learning.  Or so the book claims.  She can already say words, but now she's preparing to put them together into simple sentences.  To me it sounds like she is sudden practicing her glottal stops all the time.  No matter what purpose it really serves, all the chatter is pretty irresistible.