Dear sir/ma'am,
It is a serious issue, you should not wait till the investigation is over rather send her a legal notice and file a case against her. Since the SCREEN SHOTS can easily be fabricated, after filing a complaint, her phone and emails will be checked by the court as these can not be fabricated and can be traced by the cyber experts even though it has been deleted.
If you think those chats were not done by you, you need to stay positive and take action against it.
you can file an FIR against the lady for defamation, cheating, criminal breach of trust, misrepresentation, fabrication of evidences, producing fake evidenced, and she will be liable for punishment under IPC .