1099 vs Statements for yearly Tax Filing

I am not sure how to ask this question so please be patient. We are at the age of caring for our parents. We are helping my mother in law take care of her finances and such. I have been learning as much as I can about the royalties. I have discovered that she has never used her statements for filing taxes. She has always used HR Block to prepare her taxes. She only gives them her 1099. It appears that she should have been using her statements in order to write off the expenses and tax deductions on the statements. I need some suggestion on this please.

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