Hearing what you did and how you handle such a hand will probably do a lot more good than my answer. I have stumbled my way thru a couple of games of Omaha Hi/Lo and done very badly indeed.
But, looking at your hand the way I understand the game I would probably fold against an all-in bet. Of course that would also be influenced by the play of the all-in player prior to the hand in question.
Knowing nought about it, what i see in your hand is 47 toward a low hand, 2 cards toward a K high flush, a pair fo 4's of course, or 4h7h toward a low straight flush. None of those would make me feel warm and fuzzy about facing that all-in.
Please enlighten me blue.