HELP! I lost my Mexican Redknee Tarrantula in my room!?

I was keeping my smithi in a deli container basically, and I left for the weekend. I'm not sure if she pushed the lid off or if I made a mistake, but I came in Sunday(today) to find her gone. Absolutely no sunlight hit the container. Its still a baby, and I'm worried it will die or has died. I'm not scared she will bite me since she's very sweet and docile, but I'm scared for her health. Has this happened to anyone else? If so, what did you do?