
Why can she suddenly read now lol?

I thought it was that too but in chapter 2 or 3 where the system already increased her intelligence, she was asked to read some paper and all she knew was A for “Apple”, so I was under the impression that only her emotional intelligence was buffed or maybe the system decided that reading was not really a skill needed for her to find suitable guardians.

I mean, she’s still a child. I don’t think the system will suddenly removed her childish innocence. However, in chapter 2 or 3 where her intelligence was already increased, she was asked to read some paper and all she knew was A for “Apple”. Then, few chapters later, she can suddenly because it’s necessary for the plot? So, the system can just suddenly give her a buff every now and then, so long as it’s necessary to the context?

Well I'm going off from the book and the system does level up her intelligence a great deal. Which, as mentioned before, is a double-edged sword coz she doesn't have the experience or common sense to back up her theories. Her ideas are mostly harmless though so there's that. It helps that she doesn't have a malicious bone in her body.
I hate that I like this so muchh