Hi Doomed Man,
She will have to provide strong reasons to give these evidences later and court will take a view and may also impose monetory fine to accept them.
Dontr worry about the new evidences, if produced and accepted by court, you will have right to again cross examine her based on those documents.
Also if you feel those documents can harm u, be prepared
Like if she produces emails or whatsapp chat then your defence is to deny them and also she needs to produce them with a certificate/affidavit according to (IEA) Indian Evidence Act section 65b.
Educate yourself on IEA , read judgements and all sections.
Go to Law Library and educate yourself..it will help immensely.
All the best.