Sing Lung taught Leung Kwan (Teet Kiu Saam), and his disciple Wong Yan Lum taught both Wong Fei Hung and Wong Kei Ying. The first time I heard of this was directly from Chau Wing Dak during a session on the Tiger Crane form. I didnt think much at the time but then heard it brought up several times so decided to check it out. I went to Lo Wai Keung of Lama Pai who confirmed the same story. Master Lo is one of the most knowledgeable and capable masters Ive ever encountered, just had to mention that! Anyway, there are mentions in some old chinese texts that I could dig up if you want something substantial, but it doesnt speak further than what I said.
And from what I saw in your other posts the "white crane" is not that of Lama. That particular White Crane that is popular now days was a faction of Lama Pai that was the product of one of Wong Yan Lum's students, so this White Crane didnt exist back then, at least not by that name.
Hard to get to the bottom of the Wing Chun lady but it really looks like its the same person. Ng Mui founded the Fujian White Crane (correct me if Im wrong), and according to folklore taught a girl named Yim Wing Chun whom the Wing Chun people today now claim either wasnt real or simply wasnt a part of the Wing Chun style. And the wife of Hung Hei Goon was said to be a practitioner or developer of either White Crane or Wing Chun White Crane, and named Wing Chun. Maybe there isnt any reason to believe there is more than 1 person here?!
Ill check into that matter and that of the drunken component (I still think theres something unknown there) on my side of the world and get back to you with what I find... if anything.