There is no way to know what Audrey feels after hearing Touchstone respond to Jaques in Act III, scene iii, because Audrey doesn't say anything further after Jaques reveals himself to be near at hand.
If Audrey doesn't say anything or do anything, there is no way to know what she is feeling unless another actor makes mention of how she is feeling.
Many people might guess that she is annoyed of put out or even actually angry because Touchstone has been convinced to put off the marriage, but there is no evidence of this whatsoever.
We know nothing about how Audrey feels. We might equally say that she is content and happy as she sees the wisdom of the choice.
Come, sweet Audrey;
We must be married or we must live in bawdry.