AIO on my friend's sudden attitude change towards me???

Hi so for the context I 16 F and my best friend 17 M F both school buddies and are friends for over 4 years. This year we are in 11th grade and we our classes have not started yet but we are choosing extra classes or coachings in basis of what the subjects we will choose and both of us have chosen physics chemistry biologyy and maths and also our we have two language classes respectively . So as any other best friends we both took all classes in the same coachings. She is from a very non middle class family like there mummy and dad both are in government services and are earning very well while my parents are lower middle class. so this is why I think we have we may have mentally thinking differences?

Today when we were returning from our chemistry coaching, she just started to blow up she first scolded our driver because ride and the rider because he was half an hour late all though they both know each other and I am the other person here and she was like going on like I called you at 8:30 you show that at 9 what is happening and like she was going on and on and the driver also was some what frustrated and he gave some rude answers. okay understand this is too much but you should not be like blowing up in the public like you can talk and she was best of the whole whate and when we reached home she again started to blow up and then she started to kind of ignoring me the again hugging me the I was like bro what the hell are you doing right now ???and after that she call me in the evening and said you want to do I want doing to study right now she said okay and hung up. Now it's 9:16 and she call me just now that if you want to do cardio this late I won't be able to do it with you and she was asking me for some notes and I told her that you took the notes yesterday with you when in classes I give you my note and she was very going of like I don't like this subject why did I took this and I said you took this on your no I didn't choose it this results are still there I am I have a choice okay you have won computer you take computer but don't listen to anyone else because in future you can't blame anyone about your choices you choose this and now this is all your decision so please don't blame your mother me your father your relatives who ever you want to be Put The Blame On I told like this and she just went of like no no I will not I don't want to talk to you right now about this study and after that if I do cardio at night I will call you . And for additional information we both are from Indian families and we are in India so this is a bit of a Indian culture thing to take to pure science or what we call as physics chemistry biology and mathematics this is as the core science of Indian education system. And also that she my have a very short temple which shoot also be and I am the common in our friendship like she just blows up in two or three seconds and then come downs in the next two three minutes and I am the one who comes who is coming every situation I give angry very very rare and for my side of silent treatment and for her she just blows up . So am I over reacting or is this valid???