Hi all!
Hmmm.... an Overprotective-to-the-point-of-Chronically-Anxious-and-Controlling mom. Something I can definitely relate to.. ^^;
There are some really insightful and (IMO) useful advice whizzing around here. Let me just take the opportunity to say that @sesame, it seems you are heading down an incredibly admirable road with your passion in psychology and your desire to teach and help people with their internal problems. It's a really noble ambition!
From your mom's POV, however, it might look like you committing career & financial suicide xD, which is a painful notion for any caring mother.
As @PAYNE1 says, she is really just worried sick about you and your future, but it is to the extent that it's probably smothering you and blocking you from moving forward towards your ambition. This will probably start to make you doubt yourself and will form a solid negative feedback loop until you decide it's time to stop.
I don't really know much about psychology in terms of how best to start a career, but my advice to you would be to research and get as much support from professionals in the field as possible. I'm sure your professor would help you out
One thing that helped me (and is still helping me), is to picture the huge number of people you can genuinely help through psychology, and how much fulfillment you will gain from it because it is something you truly, deeply care about and believe in. And then tell your mom about it - tell her about your passion. Once she slowly but surely starts seeing your passion and your conviction, she will begin to understand and she will start going from LOCKDOWN mode to APPROVAL mode.
You really won't regret making this decision down the line. So best of luck!!
PS @brokenandalone1234, are you by any chance asian? lol