Your late wife must have been a good lady for you to continue to remember her. Yes, of course you can do dua and pray for her forgiveness, as long as she was not hostile to Islam and she knew no better.
Islam preaches inner and outer modesty, and as human beings, we feel more safe and secure when we are covered up. This is why all religions somehow promote covering up and not being exposed for onlookers to see.
If a non-Muslim wishes to dress modestly, then of course that will benefit her. If she wishes to dress like a nun, or as Muslims, then that is also her choice, and it would not be considered as being 'inappropriate'.
In the case of a Muslim woman, or non-Muslim, wanting to, for example, enter into a holy shrine, there is a requirement that she does wear an abayah/chador. It is not Islamically mandated, but just out of respect.
Real Christians are those who follow the real teachings of Jesus Christ. Jesus Christ gave the good news of the Messenger after him who is called Ahmad. Old bibles have this fact despite changes made many to hide it in other versions of bible.
Islam is the real message from God Almighty which is sent to all human beings. Jesus Christ wants people to follow the message of God. More details can found in many specialised websites. If she has specific questions she is welcome to write.
Islam teaches us that we are responsible to others. We must be kind to God's creatures. Whenever the Qur'an advises us to donate, it does not make it specific to Muslims.
Yes, if you have to choose between a poor believer and an infidel, it is preferable to help the believer.
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