Hello, to find the Trainee girl's stuff use the Book quest locator as follows:
1. Tap "Tab" key (Opens the Book)
2. Use Up Down (or W S) keys to navigate thru the shown quests on left page, details of each page can be seen on right page.
3. (go to the Trainee Quest) then tap Enter or Left Mouse Button > Nishy will auto turn in the correct direction (towards the goal) + a big blue beam will appear at the target spot (move the mouse + zoom out if needed to get a better look)
Side Note : Feel free to check help screenshots in-game ([Esc] Pause Menu > Options > Help > [Left Right / A D] cycle thru all the tips)
- 'my characters arms are still bound despite not having shackles' : it's just the reused animation (as she is still shy).
I hope this helps,
Cheers,
~NK