So I went to a translation site - put in the lyrics and this is what it came up with....

The Witch

Oh that pretty is to fly AND at two o'clock in the morning AND at two o'clock in the morning AND oh that
pretty is to fly, oh breast

Flying and to be drop In the arms of your sister In the arms of your sister and even wanted to cry

And the witch gets me carries Me al headquarters returns Me flowerpot feeds Me

And the witch gets me carries Me al cerrito sits down Me in its legs gives Me of besitos

Oh tell me, oh tell me, oh tell me you as many criaturitas has sucked itself you? None, none, none does not it
see That I walk in pretensions to suck me to you

And now yes damned witch Already you chupastes to my son Already you chupastes to my son AND now yes damned
witch

And now you are going to suck AND your husband the navel AND to your husband the navel AND now are going to
suck him

And the witch gets me carries Me to its house returns Me flowerpot AND a pumpkin

And the witch gets me carries Me al cerrito sits down Me in its legs gives Me of besitos

Oh tell me, oh tell me, oh tell me you as many criaturitas has sucked itself you? None, none, none does not it
see That I walk in pretensions to suck me to you

Somehow I don't think it's acurate as I get the feeling, from the acting in the film, that it was actually something along the lines of 'You Bastard' to Diego. After all, she was trashed and pissed off at him. Why would she sing about a witch? It has no connection to the film whatsoever.....