hi there sabrina,
In looking at the routine, my guess would be OT. Have you tried a slightly shorter 2nd A time by chance? I would think that if she resettled again from 3-3:30 then perhaps she was OT for that nap. Also, I think the A time after the broken-up 2nd nap could have been shorter - maybe between 2-2.5 hrs and then the catnap. The A time after the catnap seemed quite long as well since she only did a 25 minute CN.
What do you think hun?