Loan from a foreign relative

Hi,

My mother (Mexican Citizen / Non-US Resident), has offered to give me a sizeable loan ($200K) to purchase a home in the US. The funds are in a US Based Bank Account, she wants to make the loan to me with zero interest.
Are there any tax implications to this?
I am planning on creating a promissory note for the loan and keep it for documentation whenever or if ever all those transfers ring any alarms from the IRS.

Any one have experience with this? How should I approach this?

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