MY MOMS CAR IS TOTALLY BROKEN AND We're STUCK. WHAT's WRONG WITH IT?

So me and my mom went shopping. And right when we were at the stop sign, the car started to shake. Like really hard. It turned off. We tried to turn it back on and it wouldn't turn on. My mom eventually got it to move back a little to a safer area. No one is helping us and people are flipping us off and seriously I'm scared. Everytime she barely touches the ignition the lights on the car flicker a bit. And it made this weird buzzing noise. The radio won't turn off and the screen on it is really hot. Someone jumpstarted us, and said something like all the cells in the battery was dead, and when they plugged in one plug, it got to 7 volts. Have no idea what this means. My mom said she is going to take it somewhere in the morning. It is a 2013 Ford Focus. It has always wabbled and grunted if we left it on a little bit, or like when we stop at a light, it wabbles when we start back up. It said the battery was dead, so we have that figured out, but why on earth everytime we press the ignition with our fingers barely, the radio turns on or the lights flicker? Someone please help!

Now everybody just calm down.

Sounds like she should call AAA.

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Vopxnbau

The batter does sound like it's worn out, but that's not the underlying problem.

Get that replaced first. If you continue to have problems, take it to a mechanic.

Batteries wear out. So do alternators and starters. Most auto parts stores are equipped to test all of the above. In hopes of selling you overpriced parts.

Happened to me a few weeks ago right in auto parts store parking lot. Paid double for their battery because I was a captive customer on foot. (Versus what Walmart, Sams or Costco would have charged for a similar battery) Those stores are ripoffs.