Mother Teresa first joined a religious order, the Sisters of Loreto.
She then realised that she had a vocation or calling from God to serve Jesus in the poorest of the poor. She founded a new religious order called The Missionaries of Charity.
So we can say that Charity was an important part of her experience of God. Charity comes form the greek charis which means gift or grace from God. So her experience was very much a one of the grace of God, the gifts of God, the beneficience of God, and very much one of TRUST in God.