She carefully(or)cautiously snuck a peek down at the street where the shot came from.
In that bare sentence, it's "cautiously". With some more description, "carefully" is possible.
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In that bare sentence, it's "cautiously". With some more description, "carefully" is possible.
Both are OK, but 'cautiously' is more explicit.
Note that some people consider snuck to be informal English. You could say sneaked.