Don't be surprised if she knows someone in the area and asks if you are home. Does she have any contact w/your inlaws at all? I wouldn't be surprised if your inlaws don't say something to your h and he tells her about what you are doing.
They have this uncanny way of knowing when you are home. My situation was a bit different...the calls came in when I wasn't home or at work. Until one day, I opted to stay home and work in the yard and that's when I got her with the funeral bit.
Always listen to your gut instincts. Also, I'm going to offer this up to you, do not discuss any more of the calls, texts, etc. w/your h. I'm not totally convinced that he's not a part of this game. Mine played right along w/her on some of the antics. They love to get a rise out of us and see us twisting in the wind. Don't say a word for a while and see what happens.
Your situation brings back a lot of memories of stalking, etc. Stay "mum" on the antics and do what you have to do to take care of the situation. Also, do not believe one word out of your h's mouth about the ow. They will not be honest w/you until after they crash and burn or hit rock bottom and then it's a grain of salt for every word that comes out of their mouths for a while.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.