If I were you I would crate train her. The only time you should keep her in her playpen is when you are gone for awhile and she can't hold it the entire time. If you keep her in the pen during the day when you are there, she will never learn to be pad trained. Just because she goes on the pad in her pen does not mean that she is pad trained and she will have accidents every time you take her out of the pen. I had to learn this the hard way with one of my dogs.
Start by taking her out of her crate and placing her on the pad. Tell her to "go potty" or similar command. Don't let her get off the pad or wander around until she goes on the pad. Give her 10, 15 minutes being the most time you give her to go potty. If she does not go potty by this time put her back in the crate. Try again in 15 minutes. Keep repeating this until she finally goes on the pad. Once she goes on the pad praise her big time and give her a treat. As an added bonus to seal the deal, she now gets to be out of the crate for some play time. Once they pick up on that they have to go potty before they are allowed out, training will go much faster and be easier.
Note: first thing in the morning you might want to place her on the pad to avoid an accident because she has to go so bad. During the day, you can lead her to the pad, this will teach her to go their own her own rather than having an accident because she didn't have you to take her there. Always keep the pad in one place, that way she will learn where to go.
Keep track of her bathroom habits, this may take a couple days to figure out. Figure out how many times a day she goes potty, out of that how many times she is going pee and how many times she is pooping, and how many hours go by before she has to go again. This will help you out alot as you will know how often to take her to the pad and what she should be doing each time, peeing and pooping or just peeing.
Remember to be patient and consistent, she will get the hang of it, it just takes time.
Good luck with her training!!!
