Have to really disagree with you about Twilight getting blamed in Flurry of Emotions. She deserves her share of the blame in the story:

1. She struggled to balance the time between being with Flurry and organizing her time to prepare to meet the sick fillies. She had her whole schedule planned ahead of time before having that curveball thrown at her, and rather than say no, she accepted it without thought. Flurry's a baby, and babies require attention.
2. When she was at her limit, she yelled at her. You never yell at a baby, period. Flurry was absolutely justified to be scared of her, and the episode rightfully doesn't excuse Twilight at all for it.