It is hard to provide an accurate answer regarding your chances of retaining primary physical custody. The court takes into consideration a number of factors in determining the best interests of the child. One of those considerations is; who has been the primary caretaker, ie: who buys the clothes, who feeds the child, who tucks the kid in, who attends doctors appointments, etc. Being able to establish that, is a big factor in your favor. Secondly, parents who are not involved, who miss visits who aren't there when visitation does occor, often have up hill battles.
At the hearing, you will have a chance to cross-examine her witnesses and you will be able to testify yourself and have your own witnesses testify.
It would be best if you retained counsel to represent you through this.
Justin C Gearty Jr
DISCLAIMER: This post is for educational purposes only and does not create an attorney-client relationship.