Unfortunately I really don't see this happening. Occam's Razor may not mean much in the Dresdenverse but damn it, it applies to real life!
Lea is interested in Molly, has been since GP
Molly has powers of illusion, fear, and mind control
..so does Mab. Just to the ^googleplex. In fact, shes famous for it.
Molly has a serious 'thing' for Harry. Almost an obsession.
So does Mab..no wait, it is an obsession.( Mine, MIne, Mine...on HDTV, worldwide)
Mab has many names, Mab is one...not her true name. But she has one.according to JB
Mab is millenia old, and has never been replaced, she may be prehistoric, like in ice age prehistoric.
Lea could probably sense Molly's nascent power.
Psychomancy isn't that rare of a talent, at least some of the White Council's healers are skilled in mind magic (since they have people to repair the damage Peabody did). The only real thing keeping the Council from having some extremely powerful psychomancers is their policy of never actually touching the stuff.
I agree she has a 'thing' for Harry, but when did this 'thing' become an obsession?
Let's see, how many names can you think of for the personification of winter? If the number is less than five you grew up in the desert.
Likely as not she caused the last Ice Age (which we're still in by the way).
speculations:
Harry will sooner or later bend or break all seven of the laws, including time travel..now JB was kinda snarky bout that but..
The Erlking was human once, and ascended thru ritual, JB implied Mab was as well.
PG has layers within layers, but the big questions is, why Molly?
and why realy did Mab wink at the end?
As I recall, he stated that the reason Mab/Titania are as powerful as they currently are is because they used the Stone Altar as focus power into themselves. Adding on to that, Jim has implied that Mab was once as small and powerless as Toot-Toot, which to me implies that she was once either Wyldfae or simply a very minor Fae.
My pet theory for the human comments are that nature spirits have existed for as long as magic has on Earth, and that they have mated/merged with or simply adapted to the mortal, 'real' life on the physical plane as each successive species becomes dominant on the planet. Mab, in my opinion, was one of the first of the natural spirits of the time to mate with humans (by far the most intelligent creatures on the planet) and gained her power from the Ice Age that was in full swing and the advantages of having a brain much more capable of abstract thought than previously.