To my knowledge, yes she should sign the deed of trust due to her spousal rights. What disclosures would she get if it is a commercial loan? The only thing that comes to mind is the appraisal disclosure, but that goes to borrowers. SHe is not a borrower.
_________________________
I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.