Mother 94, lives independently. Can not claim her as a dependent, only paid 47% of her expenses. Receives aid for utilities/SNAP. How do we claim the cash we have paid?

Mother receives SSI, SNAP and credits for local utilities. 2017 she ran out of money and we depositing approx. $1000 per month into her bank account For 2017 this is about 47% of her total expenses for 2017. How ca we get a tax break for supporting her ? Any advise welcome. Regards, Roger and Debbie.