Alice obviously wouldn't know that Yang Ming had special x-ray vision and telescopic ability which could easily see what she did before. In the dark night, even using binoculars, it was clearly impossible to observe the situation on the opposite ship. What's more, Alice was hidden in a secret place. She never thought that Yang Ming could find out that this was her strategy.
What's more, to carry out this plan, Alice's four crew members on the ship also carried the mentality to die. This was already a great sacrifice. It could be said that the act was thorough. However, Alice would not anticipate that Yang Ming had already learned about her plans, but he still didn't know the real reason why Alice was doing this.
Although Yang Ming could read other people's minds, it required specific conditions, and it varied from person to person. A person like Alice did not have fragile will power, so it was difficult for Yang Ming to find an opportunity.