Cancel a Tourist (C) visa issued for all schengen states

[manabu]

Im the guarantee host for a Tourist Visa for my former girlfriend. Now she got the visa in her passport, but we just split. Is there a way to cancel the visa? She alread got the passport with the visa. Can the visa be cancelledby me without the need for her to bring the passport to the embassy? Is there a database for all visa were the visa can be canceled and therefore the entry in schengen can be denied?
Can i just call the embassy and revoke my guarantee?

best regards

[bandk]

You cannot cancel anything. You have no control over a issued visa.