"that she could not keep secret what she had done." It may be helpful to state what she did. Alternate translation: "that she could not keep it a secret that she was the one who had touched Jesus" (See: [[rc://en/ta/man/translate/figs-explicit]])
Possible meanings are 1) "bowed down in front of Jesus" or 2) "lay down on the ground at Jesus' feet." She did not fall accidentally. This was a sign of humility and respect for Jesus.