QuietPanther says:
... Lille needs to use a fresh stone, infused with a memory, with a fresh roll ...
If you sacrifice memories then you can use your stones from your pouch and keep the 10 you rolled.
Without a memory-sacrifice you can't use real-world items to affect the dream-world, same way your bodies can't. Imbuing the stone with a memory makes it real here.
Else you can use a local stone —and sacrifice a little of your own 'realness' to interact with that— but that would be a new roll since dream-world stones are not as potent as memory-powered ones.
You rolled the attack without first confirming that it was even possible, and we established that you and yours were not on the same wavelength and could not easily interact —without cost, each time you did you got fainter— but I went with the roll anyway and let it provide explanations and information including the cost to manifest it for real.
QuietPanther says:
... Lille had the sling and pouch with her from the beginning ...
Cool. I did not recall what all we had with us. No problem having it now either way. :)