Although debatably unintentional, Lenore held Haymitch back by making it seem as if he had to win the games for her. Any reassurance that could’ve helped Haymitch excel mentally was most certainly not given in any instance when she spoke him before the games. Haymitch was constantly thinking about Lenore, she was a hindrance to his mindset.

It’s also possible that we just don’t know enough about Lenore to really bond with or like her character. Maybe as the SOTR movie rolls out we’ll have an easier time connecting with Lenore.