If your wife is insolvent, and she sells her house, then the balance of the secured loan will become unsecured in her estate, but she will need to persuade the secured lender to remove their charge in order to give good title to the purchaser.
Your wife may qualify for an IVA, however she is best to wait until the house is sold when the secured loan postion is more certain. In the meantime pro-rata payments to her creditors ought to keep the wolf from the door on a temporary basis.
Your wife will be linked to you for credit searching purposes, but there is really no way round this.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp