Pennsylvania's a big state. If you're looking towards Western Pa., you might want to check out the Ohio Fastpitch Connection at The Softball Zone. They are currently having issues but I have heard they will be back up and running tomorrow at the latest. Next best thing to do if you're located in Central or Eastern pa. is to use your internet search engine (IE, Google, Firefox, etc) and input the name of the closest city to you + Travel ball organizations. Check the various organizations' websites to see if they have a showcase team and then make some phone calls to see if they need players if it's not already posted. Also, you might want to look at this site PA Softball
If you are in Western PA, Outlaws PA Premier is an excellent team that plays a great showcase schedule. They are mostly 15yo. Tom Shannon is the coach. Great guy, excellent coach. They are on FB or at Ohio Outlaws Fastpitch