But usually on a referral to another agent type arrangement.

You may want to charge for your time at some point if someone else fixes it since you need to arrange for a handyman etc.

What is a fair way to split the profits (if there are any)It is pretty much a contractor arrangement currently.

I would be open to short term mentoring with an agreed upon financial arrangement.

Make sure you have financing arranged before hand.

I don't believe a pure fee, arranged outside of a transaction, would be prohibited, if you're just marketing and giving somebody a "heads-up."

She could do a quit claim to her husband, then he could execute the special warranty deed.The old contract for deed was a go-to strategy back in the day, usually done improperly and full of flaws they rarely were pulled off as agreed, now besides the determination of sale issues with the IRS, these now get into other title matters, wrongful foreclosures, lost deeds, pre-arranged unlawful deed transfers and/or predatory lending/dealing issues.

Unless there was a special arrangement, the property was difficult to sell, or something out of the ordinary took place, the agreement is between the bird dog and buyer.       

If it does then something like that could potentially be arranged. 

However, the equity arrangement is much more typical and makes sense.