I've been thinking about that for a while and I believe the ship in the lighthouse (exactly like the big ones from the tower) is the ship she is referring to in the cutscene when you first meet on Venus. She may also be the sister (can't remember her name) that brother Vance speaks to in the transmission. Although I doubt that one a bit more. Which obviously she is related to Osiris and the Vex gateways based on the new quest line for no time to explain. ( on a side note FWC seems to play quite a large roll lore wise having the chasm and having their markings been around since golden age (maybe pre golden age times( can't remember grimoire) also this may have something to do with praydeth. If he is stuck in between gates right now imagine if he were to get out somehow and end up in the past actually being the one to found FWC being a very high ranking member( or founder) and all based on the classified data his ghost's memory banks held.