My wife wants to eat her placenta, is it okay if she is vegan?

So my wife is 32 weeks in and decided she wants to eat her placenta. I know it sounds weird and gross but a lot of animals do this (even herbivores) and she did some research and found it help with postpartum depression.

I am wondering if it is ok for her to eat it because we are vegan and well, its meat.
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