This is a neat theory --- but how do you account for the Mothers?
A Rite of Ascension might give you enough power to equal (or create) Mab, but Mother Winter and Mother Summer seem *vastly* beyond Mab and Titania.
Where do they fit in?
a running hypothesis is:
her time travel was accidental, and either her eixting/ ritual effect caused the last ice age (100,000+ ya) or she ascended to end it (75000 ya), and that the later queens were added in to help restor balance.
this is based on:
Harry will casue a time travel accident
Harry will vastly regret his bonding to the isle
Mab's words could be interpeted to mean she wasa the first sidhe. Now some believe she was speeking poetically, but im not sure Mab is that peotic...
as to Molly unconciously summoning the fetches, honeslt I just dont buy that. A likelier explanastion is Mab sent them after her in the fist place, to get PG rollling...all of which lends support to my insane idea.