Perhaps a link if the article is available would be good.
I find it intriguing that the MOH was bestowed on a non combatant as I should imagine that like the Victoria Cross recipients that the medal can only be earned in the face of the enemy I mean even the aerial mine disposal experts from Vernon in WWII could only get the George Cross as they were all RNVR for delousing those frightful mines.
It's all in the book called Softly Tread The Brave By Ivan Southall.

So I gather with this person does the President have a say in the medals investure or can this only be done as stated above by a board and if this does not say sit well with the president can they use their presidential authority to veto the boards decision and present the medal anyway.

So I found another article it seems Jimmy Carter reinstated the medal legally right at the bottom of the article it states this fact, she would have been a fire breather I reckon certainly got some gumption doing what she did in that time period.
Biography: Mary Edwards Walker.