It's best to use a tilted x-axis for an inclined-plane problem. The incomplete pictorial representation shown in (Figure 1) has drawn Isabella at the beginning and at the end of the motion and has identified three kinematic variables associated with each point. There's also a symbol for the angle of the slope and for the height she reaches. Which of these variables do you know (1) from the problem statement, (2) from a reasonable interpretation of what's happening in the problem, or (3) from how we usually lay out coordinate systems in physics problems?