The other person (whose name was possibly Iimkat, and then again possibly not) chattered on incomprehensibly, seemingly just for the pleasure of it. She didn't seem to be giving any thought to communicating, but Syrinx picked up what she thought might be a few words; t̹̝̖ẖ̰̘̀i̛̘̣s̮̝͖ was the odd bifurcated spear, and the fruit was o͕̼̤̩̯̞̣n̛̠͓͓̞e͖̬̝̣̜͘. She essayed a few jabs and parries with the spear, and decided that it was not a very good weapon. Seeing the way that Iimkat was looking at her, she put it back down.
"Sorry," she said, "I wasn't stealing it."
Somehow, then, she knew weapons, and that this was not a good one. That seemed like an odd and not very useful skill to have been created with, right now, since the only animals were bugs and the only other currently extant person was a short, friendly brown chatterbox.
The fruit was juicy, sweet, and entirely edible; now that she knew that, she could climb the small copse of trees in the middle of the islet and gather more. She had to return to the ground several times with her harvest, having nothing to carry it in, but soon had a nice pile of several dozen plump red fruit. Back on the ground, Iimkat roped her into (odd thought, that - it implied someone was being tied up) holding fronds of the shrubbery, which Iimkat then set about weaving into a ... thing. Basket. How clever! The fruit went in one basket, and now she could carry it more easily.
"Over there?" she pointed towards the headland with its thin trail of smoke. "You'll need a, a ... floaty thing. Boat."
Lacking any other way to communicate this concept to the other woman, she drew it in the sand; a kind of tetrahedron sitting on some squiggles, with a pair of stick figures aboard. Of course, there was a marked lack of boat on the islet. She had the vague idea that primitives could make boats out of hollowed-out logs, but neither of them seemed particularly primitive. Perhaps the log itself might do, in a pinch; but she hadn't seen any fallen logs, and to chop down a standing tree would require some kind of specialized tool. Syrinx wasn't quite sure what such a tool would look like - it hovered just beyond conscious recall, alongside the remaining mental detritus strewn about by her creation earlier this day - but she felt that none of the supplies in Iimkat's crate was it. Perhaps the other woman had ideas? She flattened the boat drawing, replacing it with a log, then drew a tree upright, with an arrow arcing down to the horizontal.
"We need to chop down a tree, see? You don't understand a word I'm saying, I don't know why I'm talking to you. Tree." She pointed to the drawing, then the foliage, and made exaggerated falling-over motions.