Why do not you watch these episodes: "A Very Special Blossom ", "Blossoms Revenge ", and "Lying Around the House " to see if Blossom is or is not a Neutral Good and Chaotic Good. Remember that Blossom has emotional complexity of high levels, opportunism and intolerance extremely high, and low self-esteem of high levels. These videos are on Dailymotion.
I think she is Neutral Good. A Neutral Good is a Good character that is a balance between Order and Chaos. Blossom is all about rules and order, but she has no problem breaking the law at times for the greater good, though most of the time she tries to obey the law and respect rules and order. She is a mix of Lawful Good and Chaotic Good tendencies, which is basically what the Neutral Good aligment is about. So she's Neutral Good in the sense she always obeys the law, but has no problem breaking it when necesary.
However, she is everywhere listed as an example of Lawful Good. This is her defined aligment, she broke the law, she did mistakes, but that happened just one or two times. It doesn't define who she really is.