You use amazing images in this poem - it is vivid and alive!
That's phenomenal, Katie, and I'm not one to use glowing words like those. :D I can tell it's a rough draft, but even so,
it is very good. Its form - rhythm, especially, could use a little
work, though. After the first two lines I had a pretty solid rhythm
expectation, and then that fell apart, but I think it could come
together perfectly with some time. Hey, just for the fun of it I'll
re-type your poem, adding in italics what I think would make the rhythm
better. This is just my rhythmic preference - your word choice is ideal, and like I
said earlier, your images are great. I might incorporate rhyme if I
feel like it, so as a whole this could end up a lot different from your
poem. :) I hope it's still as good, though, or it won't be any use. :P

She walks through the wood lit ablaze with fall's color

A new season blooming where she treads

Fresh fallen snow crunches underneath her feet  (You use bare a
little later, so I feel like it could be dropped here - besides, winter
seems too cold to fit with the concept of bare feet in my mind,
although you may hold a different view.)

Winds whispering as she rouses them from bed.  (I don't
like how much Ihave to cut out of this line to make it fit the rhythm
and rhyme, so I'm going to stretch it to two lines)

She brings the winds to earth and chills them till they're freezing

At her icy touch the fire dropps from trees

And where she touched the now-bare branches

Icicles appear (I feel like even though by rhythm this
should go in one of the surrounding lines (I can't figure out which :P)
it needs its own line, like you had it.)

They steal her breath and puff it into steam.

The lady of the frost and cold leaves winter in her wake 

With roaring fires and sparkling snow and sleds (Just needed
another line here for rhythm and rhyme's sake. I'm not sure about the
sleds, but it rhymes with treads and I couldn't find anything better.)

She walks through the wood in a cloak of bleak gray

The new season blooming where she treads. 

I'm happy with that for the amount of time I put into it - you might
not be, or you might be ecstatic, or you might like a couple of the
changes - take your pick. :D Anywho, awesome poem, and my version was
super fun to write, so thank you! And if you like the line near the end
with the lady of the frost and cold in it, then the title could be Lady Winter or
something like that. My title generally lack immagination, sorry.
Anywho, awesome poem and thanks for  the fun it was to give it more 
rhythm! I'm not sure I like mine any better than yours, acutually,
though - it seems to have lost something in the transition - sorry. I'm
about to start rambling, so adios! And holy cow, this is long. Sorry
Katie and Admins! 

-EH