But it's possible that Elizabeth Dowdell got the number wrong.
Elizabeth Dowdell might have got a few things wrong. There was a big crowd around Lifeboats #13 and #15 when she arrived with her charge Virginia Martin-Emanuel and it would have been difficult to distinguish between family and friends that she did not know from before.
From her account on her bio here on ET, its seems very likely that Dowdell and Virginia arrived very early during loading of Lifeboat #13 on which they were rescued. Dowdell reports seeing the crew remove the covers off the lifeboat and the two were soon ushered into the boat. That would mean that Dowdell and Virginia got into Lifeboat #13 when it was still on the boat deck; it was then lowered partially loaded onto the
A-deck where more people were put into it. So, Dowdell could not have seen what was going on with Lifeboat #15 which was also being loaded but t that stage still on the boat deck under
Moody's supervision. IMO, it was just after #13 started to lower that Lifeboat #15 was also briefly lowered to the
A-deck for further loading from there.
As to what happened to the Sage family, they must have spent a lot of time in the steerage areas trying to decide where to go. Even though there was no language issue with them, it would not have been easy to keep track of all the children though the narrow and confusing corridors and through the increasingly excited crowd. Also, I think we must try to guess where they were berthed; from what I could see from BB's
deck plans, the large 8 to 10 sleepers of Third Class were all in the bow section, mostly on the port side. Yes, there are reports that one or more of them got to the upper decks and one girl even got into a lifeboat, only to get out again because she could not see rest of her family. But I expect there was more than one incidence like that and it is difficult to be certain that Dowdell was talking about the Sages.