Whisper Of The Deceased

My situation is as follows. A couple days ago my mother in law passed away at 410am. I was woken up by a whisper in my ear that said "john let her go". The weird part was I was saying the words with the voice. I have had past expierences of visions and voices etc. But the part that kills me is that I don't get what she meant by this statement. Yeah most would say just follow what is said and I'm sure other things would be said but I know this means something a lot more. Yes I'm married for many years and on the edge of separating but not my way of doing things. I don't give up ever. I've been discerning it but blank. I have talked to many people and it always goes the same way, they don't know. One person told me it may be an evil spirit trying to mess things up. I thought about that as well but it is just strange this came to me when she died. At the exact time. I really do not know what to do. It's always easier to help others but for myself not so easy. Being religious as I am I pray a lot and I've had many apparitions and have had an outer body expierence before. So I do believe people who have passed can visit and tell you things, if it is important and I believe it is important. The past months have been bad in my house so I'm wondering if she was telling me something in those words other then what was said. To hear this and what I am living seems to fit. So I ask If anybody could explain to me anything I would really appreciate it. It's been bothering me for while. So please help thank you