I'm currently working on trying to find a good source for live. The first time I just got an adult mouse from Petland as it's the only chain that really seems to sell live feeder mice. Unfortunately, I've never fed live before and it ended up biting her (it was removed immediately and doesn't seem to have done any damage - was unable to find the bite when she was checked over). She does have a couple largish scars on her tail which look like they're from bites.
I was hoping to try something like a fuzzy rat that wouldn't be able to hurt her until she gets well enough established that she can be switched to f/t. The reptile expo was mostly out of live feeders when I went, so I'm going to be looking at a couple more specialized shops. Perhaps it would be better to just keep with adult mice as that's supposedly what she's been fed, but it would also be good to be able to leave her alone with it, which isn't an option with something that could bite her.
From what I've found, it looks like a decent number of people's baby dumerils took a while to start eating with them. Is it reasonable to assume that she's doing ok until she starts visibly losing weight or at least for a while longer? I could weigh her, but that is more disturbance than I'd like for her until she starts eating.