I would have expected a reply informing me at that point of her intention to limit texts because of money concerns. NOT when I ask her why she isn't replying ten hours later.
So you have a expectation that she will inform you in the manner in which you expect or it is bad behavior on her part. Does she know about this rule you have or is it just expected? She must read your mind?
If somebody gives me something I say 'Thank you'. Some things are simple and I expect anybody with manners to know these rules.
