Yes, it definitely gets easier. But you have a way to go yet. Potty training can be very challenging with a yorkie. Both my boys were trained around 9 months old, and started to 'get it' around 6 months. But some YTers have said their yorkies potty trained much earlier. It just depends on the dog. At 13 weeks, she will probably have to go every hour or so.
Either way, be consistent, praise and reward good behavior. Good luck!