Back to Mac not working

Me: Macbook Pro 10.5.4 and time machine
Mom: iMac 10.5.4 with new airport express
Situation: Had Back to Mac up and running fine so I could take care of her machine. Then lightning strikes and nukes my mom's DSL box and ethernet card in her imac. She took it to an Apple store and they sold her an Airport Express as the wireless functionality on her iMac still works. Now, she's plugged in the Express and it's working fine with blinking amber, no passwords or naming of network (gotta keep it simple). Her system seems to work fine. I've walked her through a few things including ensuring that her Express is UPnP enabled and her Back to Mac is on and screen sharing is selected. Have also cycled through a few off and ons of her Back to Mac.
My system works fine as I can Back to Mac another Mac, but not mom's. On her Back to Mac setup window it shows yellow and "On", with the following message, "May have more than one device on your network providing network address. Try disabling NAT on one of the devices."
Advice?

Update:
Had mom sign off of and back into MobileMe and her Back to Mac status is now green and she can see and access my iDisk. I also connected my mac directly (ethernet) to my comcast modem and my Back to Mac is also green.
But, I don't see Mom's computer in the finder window.
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http://support.apple.com/kb/ht4907
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