I would report it, especially if the cash deposits are close together (every few days, etc.). But, regardless of the frequency, you have a customer depositing cash under suspicious circumstances.
For example: Do you know where the money comes from? No. You assume it's her husband's pay, but do you even know if she has a husband? Even if you do know her husband, what does he do to make that kind of money?
Too many questions, too few answers. File the SAR and monitor the account.
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If you approach life with pure logic you can avoid almost all of the fun.