It means she left with the only working key and it’s letting you know not to drive off without a working key, Try it with her fob only. Then check your fob batteries.
Main issue is the water pump failing and taking out the engine but I think Ford revised the water pump to make it less likely. Changing coolant frequently will help. Edges with the same type of powertrain can easily go 200k-300k.
Same paint but the bumpers are typically painted elsewhere plus they are plastic vs metal which can change the appearance. Prep is different. Common issue and repainting will fix it.