It seems like you all have read way too many isekai manhwa/manga, and don't grasp the reality behind the situations our FL are in anymore...
I know that these stories are fiction, but for a moment just try to imagine yourselves in her position: suddenly in another world, all alone, you don't understand anything about the situation this world is (apart from the zombies, and even here I think she was able to know about them in the worst way ever), you don't understand the language... what can you do?? Survive! When you try to survive you are usually desperate, nothing more and nothing less
We are all fed isekai stories where our FL became a lady/someone important/even a maid but in a fricking castle (not a nobody in a zombie land)! These FL are well fed up, brand new clothes, they surely have at least someone who they can rely on OR have read the novels so they basically know everything ahah!! Plus they seem to adapt to the situation the next day, it's something that I always found annoying.. especially for Korean women who surely does not know a medieval context (I'm Italian and I know what I'm talking about, their history and our history are nothing like similar)
So yeah, instead of complaining about how she is not suddenly able to do the right thing try to put a little bit of reality in this setting (even though its' fiction)