I am a Muslim and my wife is a Christian. She died about 8 years ago. When praying for forgiveness from Allah can I also pray for her?
Bismihi ta'ala
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.
With prayers for your success.