Bengtsson ran through the first attempt at 4.71 and was then up at the crossbar without being close to finishing in the other two attempts.
She was temporarily coached by the Russian Svetlana Romanova, who coaches Anzhelika Sidorova who won today's competition.
Has just passed 4.76.
Bengtsson's 4.66 was an early best of the year for her.
The personal record is 4.80 from the World Cup final in Doha two years ago.