Sorry to say, but your mom is a little paranoid. Whenever I ride a coaster, I feel safe because I love riding them, and there is nothing in the whole entire world I would rather do. You have a better chance of getting hit by a car as a pedestrian, getting struck by lightning, winning the lottery, and a lot more likely to get into an accident in a car. I could go on and on, but you get the point.
The media blows this situation WAY out of proportion. Sure I'm sympathetic for the people that died from coasters and rides. Especially when some kids are killed by ride malfunctions like the one mad mouse type coaster that came back down the lift hill. This wasn't the riders' fault, and it is sad.
What I'm not sympathetic about is about the idiots that think it is funny to TRY to wiggle out of their harnesses, and going into restricted areas of the coasters and getting struck by the train or riders on the trains, as in the incident with an inverted a while back. But we are talking about 6 people. 6 people! I mean come on! Out of 350 million people that ride coasters and rides around the U.S. every year only 6 have died. This number is great.
I don't want to jinx this situation, but no accidents have happened this year resulting in death. But if, and I stress IF, someone does get killed, the media will be all over it again.
I feel especially safe at Cedar Point because the last time some died on a ride was in the 70's. It wasn't the ride that caused the death either. A young teenage girl boarded Wildcat, knowing that she had a heart condition, she didn't die on the ride, but she died later. I don't know the specific details, but you get the idea. I don't know how long it has been since someone actually died on a CP ride or coaster, but back in the early 70's the only coasters that were in existence were Wilcat, CCMR, and Blue Streak.
I don't know about other parks, but I know that Cedar Point is about as safe as it gets. So don't worry about the coasters at the point.