Generally, leave new snakes along for an entire week - aside from water changes and spot cleaning - even skipping the first weeks' meal.
After a week, try feeding the way the previous owners did - same prey, same size, same method, (ex: rat, small, frozen/thawed.)
If it refuses, leave it alone and try again the following week. (Offering too often when they refuse causes stress.)
Once she has taken at least 3 successful and consecutive meals, wait 48 hours after the last meal and you can begin to handle her.