Go for it girl!!
I am more into the distance riding (I can't even believe I am writing this!)
I started with walking daily last April and did my first century ride this past September.
Did an 80 mile ride in October and now work to squeeze in 40 mile rides before the weather gets too bad.

Go for it.
Drink steadily - if you haven't purchased a camelbak water bottle system, now is the time to reward yourself.
Also be sure to eat frequently so you don't bonk.

I always carry an extra powerbar or two with me - my camelbakmodel was specially designed for women - it's a shorter water bottle system and has a couple of really cool zipper compartments for stashing power bars and cell phones - you can also clip on a little light to raise your visibility factor for cars etc.

Keep going!!!