Always great to see another girl paddler... I was in the same situation last year, tried a few boats (Jackson 2Fun, Juice, Mamba, EZG, I:3, etc. etc.) and ended up with a used Trigger.
I love this boat. It actually fits me and is great on the river. I have no interest in play boating, although many told me to get a play boat, as it will "make you improve quicker"... whatever. I don't buy it. Yes you might have to roll more initially, but you can always practice rolling, wherever and in whatever boat, when you're starting out, so why not be in something you can actually get out there and start getting it done in, rather than starring in a river version of "8 Seconds" with your boat?
I'm sure, as a rafter, you're already pretty good at reading water, so unless you specifically want to play boat, I would suggest getting a river runner that will allow you to get into the class IV you want by the end of the summer.
There's an old post titled, "Take this test" that gives a lot of suggestions regarding boats for a new, smaller sized (read: girl) paddler.
If you ever want to go paddling with other girls send me a pm. Good luck with the boat search. And don't let these under sexed buzz boys tell you they know everything... they know a lot about things like jerking off and talking shit. Except BSOE... he's ok. And maybe a few others...