As much as Lexa would like to rule from a distance and tell everyone what to do, she basically convinced herself to be a tracker for everyone and would get moving with the intention of leading everyone back eventually. (Or "leading," as it may be.)

In terms of catching the trilobites, Lexa would be keen to set up traps to figure out how to get a hold of them. Figuring out what they're doing and how they're trying to escape would be good. ... Especially if the trilobites in question could potentially serve as a food source.