Get your taxes done using TurboTax

Is claiming a dependant be your mother? I take care& live with my mother with dementia and had received a w-2 and was wondering if I could still file and claim her as a dependent. I had federal taxes withheld all year even though I was told I was exempt from being taxed because I live with her. If I file will I get anything back?  Box 10 for dependant care benefits is 0.00 so does that mean I can't claim her as a dependent? Thanks for your time!