2012 Ford Focus SE - Stability control warning light on, car will not start

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I am completely at a loss. Problem happened about a week ago. Wife's car wouldn't start. Radio said it was low battery so I hooked up my little charger and gave it a couple hours to charge and it started. Then a few days later, the stability control light popped on. Whenever this light was on, the car would not start. However, apparently, if you waited 10 secs or so, the light would turn off and the car would start and run normally. Now to today. Car will not start at all. The light will not turn off. I ended up just buying a new battery after researching cold crank amps and seeing her battery was already 5 years old. But this has not fixed the problem. Light is still on and car will not start. I know I should've taken it in when it was running. I have a basic code checker and my car has not shown a code yet.