Zara didn't fully understand what they was doing.. she believed that negotiations would take place had the people they pitched too liked what "display" she was offering them. Once she was told by the PM, she swiftly changed her strategy, so I'd let her off on that one. Remember she was key to winning 2 out of the 3 pitches, so it's not like she did a bad job. She was clearly showing enthusiasm regarding what the customer wanted, which eventually won over the hairdressers. She is very mature, not sure about her winning quite yet, she could get too big for her own shoes later in the series.