I find this one a bit less appealing too, but it's partly because the older partner isn't taking responsibility in any way. Like, the kid knows nothing, but is enthusiastic as hell, wants to learn, wants to be useful. She could eventually become useful, which would make her happy and fulfilled.
So what does the older partner do? Does she mentor the kid? Does she teach her any skills? No, first she just sloughs the issue off with "You're fine as your current (helpless, useless) self"--but only in a vague, wishy-washy kind of way, nothing that really affirms her worth or indicates emotional attachment or anything. Then eventually she says "You want to be useful? Here, have a plant. I won't tell you anything about how to take care of it, I'll just set you up for failure." Gee, thanks. Same goes for the garden stuff--"Weed these plants. No, I won't tell you among all the massive variety of medicinal plants what might constitute a weed, just try at random and I'll make you feel like a moron when you get it wrong." Uh huh. And she's supposed to be the competent one?
The servant seems to mostly operate on a "defend my turf (and badmouth the mistress for not being able to take it from me)" approach.
The kid is adorable. It's not her fault she's useless, she wants to change. The other two don't seem to want her to, but they want to look down on her for being the way she is at the same time.
(The earthworm was very cute)