AITA for making my mom cry

So a few weeks ago my mom sent me a group link for a group which us supposed to help me with my university application if I wish to study abroad and get me a partial or full scholarship. Today they sent instructions including me taking a specific exam and the fee is 60 dollars. So I go and update my mom about it on our way to church and basically explain the whole thing to her. She then says we should wait for the othe University placements for my country to be done. I then tell her that I don't understand why we can't also give this one a chance since the exam is in October/November I can pick one and prepare adequately after which she starts telling me that I don't even know anything that's going to be in the exam and starts questioning the legitimacy of the group which she sent me. She asks me if I've seen a paper before and I tell her yes it's the same stuff we did in highschool. She basically starts discouraging me from continuing the process by nitpicking everything negative about it. I point this out and tell her that I don't understand why she's discouraging me when she's the one who sent me the group and that we can't just keep saying I should go study abroad and not do anything about it. I then walk into the church alone. After the mass we enter the car and she yells at me to leave the group and says she's been crying for half the mass. She yells at me and tells me that I was disrespectful to her. I ask her how I was disrespectful and she yells at me to shut up. She pulls the car to the side of the road and tells me since I'm 18 she has no obligation to do anything for me or take care of me and I should get out of the car and find my way home since I'm 18. She then tells me that she's not paying for anything I'll need and I'm not going anywhere until I learn to respect her. I still genuinely don't understand what I said that was disrespectful, I just pointed out how negative and discouraging she was being about the whole situation in a calm manner. Anyways she's not speaking to me now. I feel bad about how the thing made her cry but I don't feel bad about what I said cause it's the truth and this isn't the first time she's made me do things or promised something then discouraged me from it. Also isn't the first time she's tried to send me away cause of an inconvenience because now I'm 18 and an adult.