The power of Vajra Yogini to purify the Buddhist practitioner's past is shown in her ability to release the past pain of the group, thus showing how she can serve as a force of release of karma for the collective as well as for the individual.
Here is a short prayer i stumble upon that can be done by those without initiation to create a connection with her:
Vajrayogini
The Trauma Goddess
Vajrayogini drinking and transforming the negative karma of her devotees
I am the diamond maiden, the player of games
The yogini is one of my forms
Showing that I am beyond earthly attachment
I am the shining revelation to the ascetic
The women in silk and roses
I am the harlot in black net and leather,
who gives enjoyable punishment
I am the glass bead master,
creating universes of form
And a spark of me is in each bead,
for I dwell in karma.
I am the Trauma Goddess,
the Lady of Pain
In return for devotion
I pull thorns from the heart
In return for obedience
I untie the knots in the belly and the head
I hold the vajra,
which gives and receives
I reshape family karma.
The Trauma Goddess is called for people in painful situations
Where anger and hatred block the path of the soul
I evaluate the benefits of revenge
And give better suggestions for spiritual growth.
I am not suited to polite society
To social striving, upward mobility, and making good impressions
I am radically honest, sensitive, brilliant, and blunt
I hold up a mirror to the best and worst facets of human life.
The Lady of Trauma is the mirror of pain
I reflect the disastrous ways that human beings interact
Then the reflections are stretched and distorted
With irony, and humor, and sadness
Loosening their grip on the heart
So that the person who seeks freedom
Can get a taste of being free.
My devotees pray:
Lady of Trauma, Lady of Pain
Ascetic and bhairavi and sannyasini and mistress
Pull me from the disaster I have made of my life
Save me from the evil machinations of others.
This is their prayer and I hear it in their hearts
As they chant my mantra.
Savior, Lady, Mother Goddess, bodhisattva,
Love me as I love you
I am desperate and bound
Free me by your grace.
I will give freedom,
but not without realization
Those who have been bound, bind others
Those who have suffered, cause suffering
I let them know how they have been affected
But also how they have affected others.
I do not wear bones because of death
I wear them because they represent what is beneath the surface
The blood that I drink is the evil karma of those that I save
And the karma is then halted and does not pass to others
I appear wrathful as I take on anger, hatred, fury, and the desire to destroy
Which are destroyed within me.
I am a dancer upon the pain of all mankind
I destroy the dark and corrupt
My compassionate side is hidden
But for those whom I love
Who have taken on my dark grace
I open a path of shining light
With pain and sorrow left behind.
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Source: http://buddhanature.com/buddha/vajrayogini.html