"When devising a strategy, she needs to take into account how well the developers test their code so she can concentrate on covering the less tested parts. She consistently checks the feedback cycle to see where it can be reduced. She looks at the length of the automated test runs and thinks of ways to reduce it; where to invest in integration tests, which give better confidence but are more costly to set up and debug; and how much manual testing is needed based on the number of automated tests."
Basically, be awesome. Quick and stealthy like a ninja. Anticipate needs and risk. Always know what your top priorities are and proactively ask the next person above you in the food chain if it's not clear. Make the product better. Make the lives of everyone around you easier. Be honest. Be brave. Be kind.