Hello Conanh,
My husband of 3 months was divorced over a year ago. His ex-wife doesn't follow him around, but she does pop up every so often through e-mails and phone calls-- she's very bitchy towards him, and she talks down on him and makes catty comments about me. I swear she even calls our house at least twice a week but never answers.
She is a bit psycho, and is obviously not over my husband yet. She lives at the townhome that my husband legally owns, and she's renting it from him (at a ridiclously low rate) as per the divorce papers. However, she's moving out in two weeks. Last week we drove past the house to check my husband's property. Apparently her neighbors (who are her close friends) saw us and actually followed us for 30 minutes. Then my husband got a voicemail from her, saying, "I heard from the neighbors that you drove past my house? That's kinda creepy. I'd appreciate it if you didn't do that again until i moved out. That's creepy."
She even sounded almost flattered! That really drove me mad because up to that point I never interfered when she made over-the-top comments. My husband owns the house! What did she think, that my husband was trying to sneak a peak at her? So to shut her up, I sent her my own voicemail: "Hi, It's ___'s wife. I was actually with him when we drove past his house. I don't think there is anything creepy about the owner of the house looking at his property and checking his mail. If you wanna talk creepy, how about your friends driving all the way downtown, following us and then telling you about it? So get over it already!"
I think she just needed to be put in her place because she's been well-behaved now. In the same way, maybe your wife needs to be put in her place and just be reminded that it's over between you two. Also, she needs to relieve herself of memories that remind her of your time together, so she can move on. So, while you can be civil to her, tell her that she can still make something out of herself if she didn't focus so much on someone else's life...