She carefully traces the edges of the door looking for hinges, some kind of locking mechanism, trap components, and grind patterns on the floor that would indicate how it opens.
Rolls
Investigation - (1d20+4)
(8) + 4 = 12
Investigation - (1d20+4)
(8) + 4 = 12
Nature Check - (1d20+2)
(10) + 2 = 12
Investigation of the door - (1d20+2)
Strength vs the door - (1d20-1)
(16) - 1 = 15
Stealth - (1d20+5, 1d20+5)
1d20+5 : (5) + 5 = 10
1d20+5 : (9) + 5 = 14
Bash Down the Door! (Str) - (1d20)
(8) = 8
Strength Check vs the Door - (1d20+3)
(12) + 3 = 15
Secret Roll