The body will exist as long as there is desire. When one body is given up, another will be gained. The body is the representation of desire. Desire is of different kinds. There is no harm in the desire to know God. Not only that, that desire must be there. To attain God, spiritual practices should be done. The body is needed for that; therefore, the thought to give up the body is wrong.
Action won't have the flavor and beauty of selflessness, if one takes pride in one's achievements. Pride is another form of ego. Amma prefers to be a sweeper who sweeps human minds, rather than becoming a leader.
Is it not the mind that has no peace? Eliminate the mind. Thus the problem is solved.
It is the body that is coming and going, the Self remains unchanged. From birth itself Amma knew that God alone is the Truth and that all that is seen is not true. She could see Her own reflection in each and every object as if in a mirror.
Amma Mata Amritanandamayi
(Source: Questions and responses of Amma in her official website)