That I didn't give back. So 65$ short she said. The videos show that I didn't pocket it, but I was let go. Was this legal? Even though it was a honest

I worked for Dollar General for 4 days. My 2nd day there after looking at videos I was put on the register. I wasn't trained on how to use it they just threw me to the dogs so to speak. Everything was hands on regarding the register. I was a total wreck! I survived the first two nights without no training whatsoever. I just had to buzz the guy that was suppose to be training me when I needed help which was every 15 minutes seems like. Anyway, the 3rd night by myself was very hectic. It was a busy Friday night and first of month. By the way they told me that my cash drawer started out with 150$ which I never got to count myself it was always put in there by another employee. That night we closed I was told my drawer was 55$ short. I was a nervous wreck! I called my mgr that same night to tell her of the shortage. The next two days she looked over video upon video. Basically told me every move I made the night before even telling me that a customer had requested 10$ back on their credit