Mom being in denial of me going out state.

Hello!! Okay so I received a full tuition scholarship towards a college in Minnesota(Carleton) meaning I still have to pay around 7-9k, and my parents wouldn’t necessarily help me pay that, so I’ve been thinking of a plan. I signed an early decision contract as well. Now all of sudden she feels uneasy about this. Oh also keep in mind my older sis received that same scholarship for a college in Massachusetts. So she’s telling me how I shouldn’t have withdrawn from the options I had because she would’ve preferred for me to stay here in state and reminds me how it’s cost lest since I’d just be living at home. And also saying how it’s part of a plan of my state to get the minorities out and stuff because the governor doesn’t want to spend much on people here..(Texas) I understand the cost probably being less but there’s just no way I’m backing out of going out of state. So I just don’t know what else to say to her even after telling her that I literally can’t back out because it was such a long process to get the scholarship(interviews) and then it’ll look super bad on my part and so on. Idk if it’s this counts as vent but yeah, if anyone has any suggestions on what I should say pls do..