Divorce Support Forums: Gift from my mother?

from the Washington Divorce Laws page:
"Washington is considered a "Community Property" state. Community property is defined as all property and debt that was acquired from the date of marriage until the marital cut-off date. The community assets will be split equally by the Family Court if the spouses are unable to reach an agreement."

1) aren't gifts and inheritances regarded as separate in Washington state, even when received when you are married?
2) if so, how do I have to make clear that a gift from my mother is a gift?

MY CASE: I received a certain amount of money from my mother. She lives abroad, is not a US citizen, and this amount is on a bank account abroad, under my name.
Questions:
1) it is a gift or an inheritance. Is there a difference?
2) does this need to be documented? Do I need to ask my mother to put this on paper? Or is a bank statement sufficient?
3) is there anything else I should be aware of?

Thanks!

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