I don't know exactly how the algorithm works but I can't imagine that it cares about videos that are too short for ads
yep! this plus:
- I don't think she's monetized and the algorithms favor monetized videos always (I didn't see any ads anywhere on or near her videos at least) and like you said even if she were, the videos are under 10min
- some of the titles of her videos are not "youtube friendly" (read: family friendly) which also makes them harder to find
- thumbnails also not "youtube friendly"
- the tags she uses on her videos, same deal with titles and thumbnails