Mine were going out for the first time about then. The only word of caution is now it's dark so early just keep an eye on her until she works out how to get back home safely, as in go outside with her, and show her how she gets back inside. I left the door open as well as posting them in and out of the cat flap both ways a few times.
Go out with her when she's hungry, she won't go far that way, and then when you/she come back in, reward her with food. I also held the cat flap open and put treats on the inside so they learned that coming home meant rewards and was a good thing.
I still don't know how they work it out, but they just do, just go careful as it's dark so often at the moment. Go out in the middle of the day with her when it's brightest.