I think it's irrelevant. Minthara doesn't care if you're lying. She believes she can wipe you out and the grove regardless. To her, it's a game, and she fully believes she will win. So making a Deception roll is pointless because the result will be the same. She'll play along and pretend you are on her side because she thinks it's interesting and cute that you are trying to outsmart her.
I’m interested that you take that view as I’d got the impression from discussions on other threads that you have some of the same problems as I do with our not being able to make our motivations clear in the game, and I thought that having a deception check when agreeing to help here would be a nice, simple way to at least partly address this problem in this particular instance (and possibly other similar ones).
Of course, it’s fine if you think it’s the wrong way to go about solving the problem, but is there an alternative you have in mind? Or is this not a point at which you care about registering your intentions?
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"
