At 57K miles the engine is almost certainly original. Check to see if the owner has done regular oil changes. If there is an oil change sticker on the windshield compare the information on it to the current date and mileage.
Look under the hood and check for paint overspray. Also look to see if all the original stickers are in place under the hood - if you don’t see the stickers it is a good indication that the vehicle has been wrecked and repainted. Look to see if the paint on the hood and fenders matches the rest of the body - slight variations can mean a paint job and that usually means the car has been wrecked
Make sure the title is good - a reconditioned or salvage title indicates the vehicle has been totaled in a wreck and rebuilt. It is always best to stay away from those cars.
If all that looks good and your mechanic checks it out it should be OK - good luck
Just because a fender has a slight variation in color doesn’t mean the car has been in a major accident.
I would guess probably 80% of cars have had some sort of body repair in their lifetime.
What? You don’t want to drive down the street sideways?