http://timesfreepress.com/news/2011/may/12/missing-womans-husband-seeks-custody-children/
Rumor: According to a comment on the article above, the children were left alone for only ten minutes before the father came home.
So if true, he had time to pass her, maybe even talk for a few minutes, but NOT commit foul play *at that time* and be home in time to be seen by the neighbor.
Corroborated: Gail thought someone was following her.
This leaves, IMO, two possibilities:
A) Gail had truly become paranoid, either through mental illness or circumstances in her life, ie abuse, that had her worried for her life.
or
B) Gail was really being followed. If Gail thinks she is being followed by her husband, she would have identified his vehicle or him. So, Gail believes she is being followed by someone who is not her husband. Hypothetically, if this is true, this leaves a few possibilities:
a) someone hired by a significant person in her life
b) someone else who has something against Gail. Who would have something against her? Someone who wants what she has in her life, perhaps, or wants to take her place?
c) Someone unconnected to her marriage, who has an obsession with her. I see this as the least likely of all scenarios simply because it would be a coincidence for it to come during the middle of a marital firestorm and is relatively rare in general.
As to safe houses: many of them advise that you contact NO ONE to tell them where you are, lest it be found out by the person you feel is a danger to you. They also might have places to store cars. However, I would think she would have taken her driver's license if she was of sound mind, and you generally do not forward your mail to a safe house I don't think. Could be wrong. Why change your pin numbers and leave your credit cards behind? The people who ran such a place would be aware of her family's search and media contacts and would likely find a discrete way to contact them or law enforcement. If such a place felt she was having additional mental issues, they would probably make contact with a mental health professional or social services to try to get her help for that. However, delusions of being followed and actual possible abuse or endangerment can be very similar and difficult to tell apart if you don't know all the facts.