The Herald understands the attack, early on July 16, stopped only when Tito's partner pulled her away.
Although it is not clear what prompted the violence, it is believed Tito was dating a man who had gone out with, and fathered a child with, one of Ms Cassidy's relatives.
Tito has been charged with two counts of wounding with intent to cause grievous bodily harm and one of injuring with intent to cause grievous bodily harm.
She also faces one charge of possessing a glass methamphetamine pipe, in relation to an incident last week.
It is understood Ms Cassidy, who also had her hair pulled and was left with a bite mark on her forehead, was taken to hospital after the attack.
She required numerous stitches to reattach her lip and fix her ear, but has reportedly lost the hearing in it.