In order to claim the full mortgage interest deduction, you would need to pay the entire mortgage payment and property taxes yourself.
You could split all other shared expenses. If the other shared expenses total at least $1400 per month, you don't nee to make any changes.
If they don't total at least $1400, you could either reduce the amount your mother pays, or draw up an informal agreement saying her share is applied only to the other shared expenses.
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