She should have included this debt in the IVA, - loans from friends and family are treated in exactly the same manner as a loan from a bank.
As the debt was not included in the IVA, you may revert to usual collection procedures to recover the amount due, or can ask your employee's IVA Supervisor to include the claim within the arrangement, so long as the arrangement provides for this. Your best bet may be to recover it via a deduction from her salary, although this may scupper the whole IVA if her income is reduced.
If the IVA is not yet in place, get details of the IP she is using and submit your claim before it is too late.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk