Hi @abigail-dantes . sorry for late reply. i started following you recently.
Science in a sense is independent of personal opinions, prejudices and bears same results everywhere. an infection is same for everyone around the globe, atom is same and releases same amount of energy everywhere. but i think that psychology is not same for everyone. every person has different views about the same thing. so how can psychology be "formulated". it is so much diverse. it is not an equation which should be immune to environment, culture or religion.
everyone is when born, he psychology gets altered according to his environment. but science is independent of birth, it already exists. if population of world is 7 billion then there are 7 billion psychologies behind it.
psychology cannot be "unified" because it does not work that way. because psychology is "in conflict" with every other person.
in a sense "spirituality" could be a science because in spirituality one has to kill himself of the world, he has to get rid of all "worldly distractions", and have to only focus on his "soul" and "spirit" only..
it is my humble opinion on the subject, you have the right to disagree.
if psychology would have been the science then there would not have any "need" for legislatures for individual countries. there would only have to be one "legislature" as in the case of science where all formulas and equations are same followed throughout the globe.
Regards
kay-khosa