Well..I would start fom scratch..just like when she was new! Leash her to you and don't let her have free reign. I would forget the bell..it's up to you to watch her and take her out every 20 to 30 minutes..after eating..drinking and playing. If she's with you all the time..you have no choice but to see what she is doing! When she goes praise her like she's the Queen bee that she is! . It won't take long..she's showing teenage rebellion and if you don't correct it and train her right, you could really have a huge problem! Good Luck and you can do this..no problem!