Coumadin user, low Vitamin K?

well, my mom had heart surgery about 1 year ago, it was a transplant on her aortic valve. Now she's been taking Coumadin (warfarin) and I heard that you shouldn't eat things with much vitamin K? But the other day she went on her check- up and her vitamin K level was severely low, so what should we... show more well, my mom had heart surgery about 1 year ago,
it was a transplant on her aortic valve.
Now she's been taking Coumadin (warfarin)
and I heard that you shouldn't eat things with much vitamin K?
But the other day she went on her check- up and her vitamin K level was severely low, so what should we do?
And she also has Atrial Fibrilation. (and takind meds)
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