Of you go to
www.petco.com and search for precision, you will find a very nice x-pen. I own it for my girl, I got the 24 inch high in black. It was reasonable and had free shipping!
As far far as the potty training... its work, and some are not fully potty trained for a year or more... Sorry. I know thats not the answer you wanted to hear.... but the name of the game is preventing accidents until then. Don't give her roam of the house, this is only asking for trouble. Keep her somewhat confined and you will have greater sucess! And sucess leads to more sucess, and that leads to real potty training! It will be a while before she is trustworthy enough to roam the house... so find that x-pen and limit her space for now. If you catch her going on it... praise Praise Praise! You also might want to look int o clicker training... it can be very usefull in potty training!