you can claim her as a dependent on your return regardless of whether or not she has to file. whether or not she has to file depends on the nature of that $10K and if she had unearned income. if she got w-2s for both jobs and she had unearned income (interest, dividends, etc.) of not more than $1150 she doesn't have to file. if she got a 1099-MISC or 1099-NEC for either one or both jobs she needs to file because she owes self-employment tax.
