Wasn’t Mulan there with Emma and Snow at the beginning of the fight with Hook and Cora at Lake Nostos? And then left after Hook saved Aurora’s heart and tossed it to them. So Mulan knows that the Lake was restored and where it is, so she and Aurora could have gone back for Philips body and took it to the Lake. After-all, Lake Nostos is suppose to return what was lost and Philip lost his soul so, the water should bring it back? And if Neal is near death, it would bring back his life that he was losing?
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"We were happy."
"Because... it was born out of true love."