Woman not observing pardah with non mahram males

Q: A woman doesn't observe pardah (covering her face). 

She works in a home. There is a man and a woman. The man observes pardah from her. When she comes to work, she comes walking and without pardah. The employees have tried to encourage her to wear pardah but to no avail. 

Now she is offered a job at another place. There it is not clear who she will come into contact with. 

My question is, if a person suggests for her to take the job, is the person sinful because she will come into contact with men. She isn't observing pardah, she is also leaving the house to come to work, so on the way she is going to come across men.

Unintentionally inhaling dust while fasting

Q: My question is related to the validity of the fast. 

While doing my Kaffarah, I was cleaning my home and dusting off some shelves on the 58th day out of 60 days. Some dust flew in the air and I inhaled it. I looked the issue up in Maraqi al-Falah and it said in the chapter of that which does not invalidate the fast, "dust or smoke alongside smoke from wood or incense entering one’s throat without one’s doing". 

Here, it is mentioned, that smoke and dust which is inhaled by ones own doing will invalidate the fast. Does the aspect of causing it oneself only apply to smoke or does it apply to dust, too? 

Is the scenario I described classed as deliberately causing it myself? Do I have to restart my Kaffarah because of the fast becoming invalide or is the fast still valid?

Woman making wasiyyat to gift her house to her husband's heirs

Q: I would like to find out if this method is correct. If not, what would be the best method? 

A man had a family. His wife passed away then he remarried. Before he passed away, he gifted his house to his wife. 

She is living in the house but she made wassiyat for it to be given to her husbands heirs when she passes away. 

She has brothers, nephews and nieces (some of them are aware and happy about her decision). 

Her husband's heirs were not yet told gifted or made owners of it.

Paying off gambling debts of the deceased

Q: A member of our community as an heir would like to know if it's permissible to pay off gambling debts accrued by the deceased to pay off multiple gambling debts accrued to Muslims and non Muslims. 

Notes: 

1. A member of family has come forward to assist with these debts as they too want to rid of their unwanted interest income in order to assist with paying off these debts. 

2. The deceased does have an income deriving property asset in his estate but the income is little to none and will take years to save and accumulate the funds required to pay off the gambling debts.

Husbands telling his wife "you are free" without intending divorce

Q: There was an argument over a mobile message. My wife said, "Leave me." I told her not to say that, but she repeated, "Leave me." I replied, "You are free," but I had no intention of divorce, nor did I know that saying such words could lead to a divorce. Later, my wife told me that I had used the wrong words. After that, we reconciled. 

Four months later, during another argument about household chores, my wife said, "I won't do this." I replied, "Then you are free," but at that time, divorce or separation was not being discussed. Later, I realized that I had said something wrong. 

How many divorces have taken place in our case?