Did you get a W2? The old amount was 6,300. Now the amounts is 12,200. Or you can file to get back any withholding taken out. If you got a 1099Misc you have to file for any amount, no minimum.
Filing requirements for a dependent
https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...
