In the realm of 'strange but true', once you file incorrectly twice, you need permission from the IRS to 'change your accounting method'.

Bottom: it could help get you through an HR dept that requires written permission to verify employment later in a fixed tenancy to verify income/employment for a renewing tenant without having to redo a consent form, but again check with a professional and research more...

Would it be ethical to ghost advertise it with her permission BEFORE buying?

If the court decides there is no contract, then the person is now on private property without permission, which would mean the police could forcefully remove the person.

I will use that on @Russell Brazil 's favorite REI quote thread with your permission. 

Some companies make you go thru them for any and all withdrawals, sort of like asking permission.

Can landlord reach directly to the tenant without  Tenant's broker permission?

One thing I have done to get around this is asked permission to post my signs on private property. 

I have a townhouse in a 4 unit complex where everyone would have to outvote me to do anything without my permission.  

She does not have the income/DTI to leverage a HELOC on the property herself, but gave me permission to seek a way to leverage the property for financing myself.