I'm almost 3 months postpartem and have urinary retention as well ( self cath every 4-5 hours). This is hard to do while taking care of a 3 month old, and I'm sure your wife can relate.
I just want you and your wife to know that you are not alone. It seems like for me every month it gets a little better (100 CC less). My urologist did tell me it could take up to 1 year to recover, which is not something I wanted to hear. At this point, I just want to recover. Also, he put me on medicine to "wake my bladder up"...maybe you could look into that. Hope this helps and I would like to hear back on how everything is going. As I'm sure you have found out this is not a common issue and it helps to hear that there are other women going through the same thing.
Just trying to stay positive
Katie
Just a follow up to this. My wife was able to void a small amount (30%-40%) for the first time this weekend, we were both so happy! It's only been 2 months so we are keeping positive. The urologist says to wait another month or so to see what kind of progress she makes before looking into other options.
Cheers!
Matt