If you don't play Quinn's path you won't be able to get close to her to get to know her, the way she acts in public and private is different.
In public she wears the front of a strong and independent girl, in private she is a girl who is lonely and wants affection, she is under pressure and
needs a shoulder to lean on.
Quinn shows her development even if you're not in her path, but you see less, for example, you can see at the end of ep9 that she regrets her decisions, apologizes, knows she has to change.
I recommend doing a gameplay in Quinn's path, it's one of my favorites.
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