We are in a similar situation where I am commuting 160 miles a day and she is commuting 8. I make twice what she does and I have a house 4 miles from my place of business, so we are moving back sometime in the next 4 months. We have the same issue with her house though, a logical selling price is basically what we still owe on the mortgage. But then with all the fees and whatnot associated with selling a house we could be looking at paying $12k out of pocket that we do not have (we are aggressively paying off other higher interest debt).
I guess if I just spent some time to calculate the break even cost I could sell her (and myself) on the idea to sell the house quickly, but we also have to take into the account that not only will she possibly not be working any more, but that there could be a baby in the near future.
That being said, she had an interview for basically her same job back where we plan on moving yesterday. We are crossing our fingers.