Sally looked around, and looked for any methods to stop the approaching flames from burning the tree, or stop the flow of fire on the grass. If she couldn't think of a better way, she would respond by dropping a few grenades between the burning grass and the not-on-fire grass, to hopefully extinguish the fire on the other side with an explosion, and uproot the not on fire grass. She had only three grenades, which she uses up there. She would follow this up by testing to see if a shot from her Gauss rifle would blow apart enough dirt to be useful in making a pit against the fire. If it was, she would use three of her twelve shots. She would then proceed to see if she could use her assult rifle in making a ditch to advoid the fire. If practical (Which I doubt), she would use that in place of her hand. If the fire spread over her makeshift ditch, she would pull out one of her twelve bottles of aqua pura, and pour it over the water.
If robin came out to see the source of the Explosion, she would look at him, and say, quite forcefully, "Help."