Her role included assisting emerging countries meet their development goals through active engagement with senior level representation from both the public and private sectors.
Her role included assisting emerging countries in meeting their development goals through active engagement with senior level representation from both the public and private sectors.
Her role included assisting emerging countries to meet their development goals through active engagement with senior level representation from both the public and private sectors.
The first sentence does not sound natural to me. I decided to rewrite it (the second and the third). Which of the above sentences are correct?