She put the 5 Adventure XP into Charm.
Xene Spends the first "Library Pass" Season Studying the L13 Q16 Intellego Summa.
The second "Library Pass" Season studying the L11 Q18 Vim Summa..
The "Library/Lab Pass" Season inventing Invisible Eye Revealed at level 15 and Sense the Nature of Vis, both with lab texts, then having a little time (read lab total) left over designs Sense of Magical Power without a lab text (InVi2). Her InVi LT is 26, 15 for Invis Eye, 5 for Sense Nature of Vis, and 2 doubled to 4 for Sense of the Magical Power. I imagine her practicing with the low level effects is quite frustrating as her Spontaneous Magic is affected by the Chaotic Magic flaw.
During her seasons spent in the lab, may she allocate some or all of that exposure to Covenant Lore: Polyaigos? I'd rather not end my apprenticeship with just 2 xp hanging out in that ability and no score to show for it.