Not-for-profit rent from disabled adult child

My daughter is a disabled adult, and lives with us, her parents. She collects SSI. The Social Security Administration requires that we charge her rent for her to collect the maximum benefit. However, this "rent" is below market value, and is really just a reimbursement for our daughter's share of the household expenses.

Do we need to report this are not-for-profit rent? Can 100% of it be claimed as expenses since it is really just a reimbursement, or can we just not claim it as income?

Thanks.

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