Do you mean chapters from before ch27? these have official translation so you'll need to get these.
What are you expecting from her? even today there's so few people who know how to make stuff from start to finish that it's normal not knowing how to craft stuff, have you not heard about how there's probably no one on earth who knows how to make one BiC pen right now? as each part is handled by different people/industries, just like an aircraft, people have the knowledge but it's all over the place (that's also the premise of Dr. Stone.) And obviously there are no books that explain how to make these things as they are the goods business profit from, not like Urano was reading fucking manuals instead of the endless amount of real books she could be enjoying.
Fair and how many of those are bibliophiles who worked in libraries and, from the story, would read mostly actual books instead of fantasy ones?
That excuse does not work with the character Myne was build to be before reincarnating.
That is without even bringing up what normal obligatory education would make be common knowledge like electricity and basic physics.
Also... you are wrong about the "there are no books that explain how to make these things as they are the goods business profit from" as anyone can have access to patents and they will have the blueprints and how to build anything you just can't use it without paying royalty. Even your bic pen example is just a matter of looking up the patents for the parts that make it and while making a ball point pen would be ludicrous in a backwaters undeveloped shithole world like the one she is right now there are a lot she could be making/researching with the resources she has available, a simple vapor engine for example.