4 and 6? idk man I'd tack on at least 2K to the recommended break in numbers. i shifted at or before 6 for the first 500 miles then at or before 8 till 1000 miles.i know you want her to take it slow but the ninja 250 engine is meant to be revved hard. definitely the shifting will slow her down so that is important to work on first but....in 6th gear at 4K RPM that bike is only doing like 45 MPH. so the fact that she has to make 5 shifts whereas you only have to do one will definitely slow her down.
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