The subject of the sentence is "girl". If you cut out the extra information, the simplest form of the sentence is "Girl tries".
I would say that it hasn't increased 20% because 1. if the starting percentage was 18%, you would see a larger precentage but that isn't the case.
The point of view in this excerpt is third-person omniscient because the excerpt uses she, herself, it, her, etc. A first person point of view uses the pronounce, I, me, myself and other pronouns that look likes you told the story yourself.Second person point of view uses you, yourself.
