From the MCAT Discussion forum, I've seen many people suggest that it would be preferable that in the few practice tests before the real MCAT test, you should be scoring 2 points above your desired score. Your friend's average is 22-23 and should expect to score around this. Not sure if this would be enough for DO and I am concerned with her fluctuations in the science section as well as the consistent 6 on the verbal which can be difficult to improve and most people actually report LOWER scores on the verbal section than what they got in practice. With such a risk with the verbal score, I would advise her to postpone unless she can see marked improvement in the next week in her verbal score/an increase in the average last two/three practice tests to at least where she would like her score to be.