The current situation was quite different from those people who did not know that they were being watched or followed.
None of the tasks that Ash had taken on so far had failed with others.
The target was aware that they were in danger and that others could be pursuing them, so they would be paying attention to almost anyone within their surroundings.
Even going to sleep for a couple of minutes when she thought it would be safe to do so could become the very thing that could put her in danger.
If the target happened to notice her and became suspicious of her, then they could just as easily find ways to monitor her activities and wait until she let her guard down to run away or take the opportunity to strike.
Her usual methods would not work for her, so she had to find a way to make things work.
Even the usual approach did not seem to be so good, given how the target had such high vigilance.