Is the person she replaced married to the person he replaced? If not, I doubt there is a need for divorce. There marriage was hundreds of years ago, and while they don't recall it, they did both eventually pass away.
As for caution, well. With such a sticky situation, someone is bound to be hurt. As I've a fondness for you, I'd rather it not be you. I also detest people messing with unions I have blessed... But sweetpea, you can't worry on if she hates you or not- who cares?
Yes, my husband. Still technically married, and yet he's not here. Does it leave me free to marry again or no? And what if he does show? Sticky all around, no?