Wow--what a shock to you and to your sweet pup! She is absolutely adorable both fluffy and with the short 'do, but I'd definitely have some t-shirts, dresses, or pj's in her size around in case air conditioning might give her a chill while she adjusts.
My Piper turned one today and although I've never cut her hair, I've recently considered giving her a puppy cut. I'm going to be anxious to see the progress as Pepper's shiny new coat grows in.
Good luck and enjoy the tangle-free days while you can!