No. I'm assuming she's illiterate because she's like me.

[A warrior of roughly the same time period (she didn't seem so alien like other Shard-Bearers), and whom didn't seem the type to have gone to an Officer's Academy. In fact, considering what he felt when he told her of the Nabateans...]

Jeralt only taught me the very basics of reading, and the rest I taught myself. Most mercenaries only know the letters to spell their name, or to understand cardinals and numbers. It's thought unusual to find a fully literate mercenary. Normally they're disgraced knights or some such.