From the very first lesson, she already surprised my quite a lot by how quickly she could do simple addition problems. And later, she has never stopped surprising me by other, even more complicated, math problems.
Is "from the very first lesson" correct here? I mean, on one hand, the process of surprising is still lasting until today, so using "from" seems to be legitimate. However, it was exactly the simple addition problems that was the main source of surprise on the first lesson, while all the following reasons on all the following lessons were not addition.
However, if I say "On the very first lesson" (or "At the very first lesson"?), then can I still keep the word "already" in the first sentence ("On the very first lesson, she already surprised me quite a lot by...")?