An employee's leave accumulations have been deleted and that employee can no longer be added to a pa

I am using Reckon One and have a staff member who is Part Time and accumulates Annual Leave, Personal Leave and Time Off In Lieu. I've opened my payrun for the week and this staff member is not on the payrun and can't be added (not on the dropdown menu). I went into her Employee info and she's still there but her leave details had been deleted. I've added the leave details back in. I've checked her past payslips for the current quarter since she moved to Part Time and her leave is not accumulating each period. I still can't add her to this current payrun either. Not sure what's happened as last payrun it was all fine. The only thing different last payrun was that she used some of her personal leave and time off in lieu; apart from that all has been the same and I have not been back in the payrun area since. No-one else has access to it either. Any suggestions/help would be appreciated.
Thanks Jodie