Good idea now..
If she was tested and presumably treated? At 4 1/2 sme still have accident, but if she did better before and now worse, it is a good idea to get her checked out by a pediatric urologist.
Make you gently support her and not punish for her for having accident as this will likely make it worse. Find ways to encourage her, use frequent br breaks, and reward her when she does good..Best of luck.