Dumbing myself down? (Changing majors)

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I'm switching from a very vigorous major (molecular biology) to psychology because I'm not passionate about bio. And to make things worse I'm not good at the classes, they don't stick with me, I'm not passionate like the other bio kids. I love psych and ive always been interested in it, but my mom says there's no money it and got super super mad at me, talking about how she wouldn't help me anymore if I switched majors and that it's not about my happiness. Money is more important. But she kept saying I'm degrading myself, basically dumbing myself down with a psych major. That I can't do anything with a psych major. I just don't know what to do. Any advice would be nice 
*** forgot to mention I would still minor in bio