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Hello, thanks for posting
It sounds like the engine ran out of oil oil was very low on oil in order for this to happen, most likely the main and connecting rod bearings seized. This can happen at lower engine speeds of around 2500 rpm which is about right at freeway speeds of about 70 mph. So assuming that she was going at about that speed a rev limiter would not help the lack of lubrication, I'm not even sure this model has a rev limiter but the computer is designed to turn the fuel injectors off at around 105 mph.
Hope this helps explain it, thanks for using JA.