There is a Yahoo Group for female grads; however, it really is just for grads and I don't think the posts there would be particularly useful to future/current mids. You might check Yahoo Groups re something for current female mids but I've not heard of anything.
As for hair, in my day, we had to have it cut so that it was above the collar all 4 yrs. I know that, not long after we graduated, USNA allowed female mids to adhere to the USN standards (can be longer provided that, when put up, it is above bottom edge of collar). I also thought they allowed this for plebe summer for awhile but may be wrong about that.
In any event, if they require you to cut it for the summer, that's a good thing and, if it's not required, do it anyway. Other than Sundays, you will absolutely NOT have time to do anything but wash it. I can't remember a single time during Plebe Summer that I blew my hair dry or styled it or did anything other than run a brush/comb through it other than Sunday morning. That changes during Ac Year but in the summer, a short, easy-to-care-for style is your best friend. Seriously.