Not a Coach,
Here is a better progression...
2013: 1:57.91, 4:00.94
2012: 1:59.14, 4:09.96
2011: 2:01.07, 4:10.77
2010: 2:04.76, 4:18.17
2009: 2:00.85, 4:09.52
2008: 2:02.34, 4:17.09
2007: 2:04.22, 4:21.18
Looking at the above, Brenda looked poised to break out in 2010 but for whatever reason, she stalled that year. Looks like 2011 was a year to get back to where she was in 2009, 2012 was a continuation of that with clearly a focus on the 800 and this year she put everything together. The above progression is exactly what one would have expected from Brenda back in 2009 if she continued to progress and add a more aerobic base to her training. In my eyes, people should have been jumping all over her in 2009 thinking ahead to 2012. Would not have been a bad bet to make. After going from 2:04 ro 2:02 to 2:00, and 4:21 and 4:17 to 4:09, as good a bet as anyone at that time, I would guess.