I will try to remember (with the help of Grandpa's notes) what she said.
Her first point was that Heavenly Father can use us even with our imperfections. She told the story of a girl she knew at BYU who was relatively new to the church and felt her testimony wasn't very strong. A group went on a hike and that girl was having a hard time breathing so she stayed back resting on a bench. A boy came by and sat down beside her and started up a conversation. He wasn't a member so he began asking her about the Church. She was able to answer his questions and bear her testimony!
Esther said that loving others and teaching with the Spirit were the most important things she would need as a missionary. She used an analogy that God is like oxygen. We don't really think of the oxygen around us and how we need it to survive. God is around us too even though we're not aware of it. She talked about how we need to be worthy to have the Spirit with us.
Regarding love she told how when she was younger she was a handful and had a mind of her own. Her Dad would have to correct her but he always did it gently with love. She knew he loved her even when he was correcting her.
She challenged us to give referrals to the missionaries so they wouldn't have to go tracting!
She bore strong testimony about the apostacy and restoration of the gospel in our day.
We could feel her love and strong spirit. I know she'll be a good servant of the Lord in Brazil.