Regarding 80C and form 15G and 15H, Net income from FD Interest so can i file form 15G and use 80C and 24(A)

My mother is 63 years old, She had taken home loan and paying its installments for interest form fixed deposits. Total Interest earned is 4 Lakhs this year,

Amount Paid to the Loan as base Section 80C : 100000
Amount paid as interest 24(A): 150000
Net income after these 80C and 24(A) deduction is : 1.5 which is below 1.9(base income tax slab for female)

But the bank is deducting TDS , so she can submit form 15G(this year) / 15H(next year) so as to avoid TDS deduction.

Thanks,

Ram