Caroline was neither saying she did not trust Liberty nor that Liberty would definitely go after them, but people would change, so who knew what would happen tomorrow? It would be best to leave now, while Liberty and the others were not planning anything against her, so that no one could provoke her into opposing Liberty.
This way, she would preserve the best impression and keep things amicable between them, so that if they encountered each other in the future, it would not feel like they were