Need help on what to do about next step on potty training.

We have a soon to be 3 year old little girl. We have been potty training her since age 2. We thought we had been doing pretty good with just a few accidents here and there. Bed time was our only hurdle, so we thought. But recently she has been wetting her pants atleast 3 times a day. She is still wetting her bed atleast every other day sometimes she would go as long as 3 days with not accidents at night. She seems to know that she has to go pee but she just sits in one spot and pees and then trys to hide and continues doing what she was doing. We dont have any poop accidents, just pee. My husband and i are thinking maybe we should put her back in pull ups atleast at night time. But every one i talk to says to never put them back in diapers or pull ups after they have been in underwear. We are especially worried to do this since shes been in underwear for almost a year and we dont want to confuse her. If anyone has any ides on how you can help us please let us know.