B.R.
Checking some of your other posts let me know that she is about 2 1/2 years old. I don't think you can say she's totally potty trained at that age, even though she may have seemed so for a while. In my experience, when one seems trained that young, there is often a reqression stage they go through. It's frustrating, but something you have to just be patient with, and keep on working with her. One thing you mentioned that I picked up on was taking the small potty out of her room. My opinion, of course, but the child's room doesn't seem the proper place for the potty anyway. Bathroom functions need to be kept in the bathroom. Perhaps having taken that potty out of her room will actually be helpful to you in getting her back on track with her training.
Also, if you have reacted in a strong way to her playing in the potty.. perhaps raising your voice, (and you did mention spanking her), it may be part of the reason she has regressed to peeing everywhere. You do need to be firm when dealing with something like that, because you want them to know it is definitely not ok to do. There is a difference though in being firm and being punitive. Perhaps you can try taking her firmly by the hand and lead her to the sink to wash up while repeating (for the 10,000th time LOL!) that we just don't play in the potty, or toilet because that is gross.... or whatever word you choose to use for it that gets the point across. I know it's difficult when you feel you have to do that sort of thing over, and over, and over again... all in the same day, but it's part of helping these little people learn and grow.