Which lines in this excerpt from Macbeth act I, scene 5, show that Lady Macbeth doubts Macbeth’s willpower?
[Enter Lady Macbeth, reading a letter.]

LADY MACBETH:
"They met me in the day of success: and I have
learned by the perfectest report, they have more in
them than mortal knowledge. When I burned in desire
to question them further, they made themselves air,
into which they vanished. Whiles I stood rapt in
the wonder of it, came missives from the king, who
all-hailed me 'Thane of Cawdor;' by which title,
before, these weird sisters saluted me, and referred
me to the coming on

Question

Which lines in this excerpt from Macbeth act I, scene 5, show that Lady Macbeth doubts Macbeth’s willpower?
[Enter Lady Macbeth, reading a letter.]

LADY MACBETH: 
"They met me in the day of success: and I have
learned by the perfectest report, they have more in
them than mortal knowledge. When I burned in desire
to question them further, they made themselves air,
into which they vanished. Whiles I stood rapt in
the wonder of it, came missives from the king, who
all-hailed me 'Thane of Cawdor;' by which title,
before, these weird sisters saluted me, and referred
me to the coming on