It depends. Dependents must make under $5,050 in 2024, so she meets that test. As @DoninGA points out, there are other tests to be a qualifying relative, so review the list to ensure she meets all requirements.
As far as filing a return, she isn't required to file a federal return. If she had any federal income taxes withheld, she can choose file in order to get a refund. Also, check your state's instructions to see if she needs to file a tax return. Some states require tax returns to be filed, even if you don't make enough to be required to file a federal tax return.
