Well, we can easily see that each time, 5 points are going up. 68 - 63 is 5. 63 - 58 is 5. Thinking that each time 5 points will go up, I wold do the following steps.
85 - 68 is 17.
17 divided by 5 is 3. 4 = 4
3 + 4 = 7
My final answer is on her seventh assessment she will be scoring higher than a 85.