First and foremost I doubt if she is sick so maybe that will bring you some comfort.
Secondly, I think she is probably stressed and that's why she's not eating. It could be from a few different things. One being her cage mates. Maybe one or both of the other two are causing her stress which might make her lose her appetite. Not neccesarily just during eating time but other times as well.
Maybe it's her environment that is causing her stress. She's in this brand new environment and it make take her a week or so to settle in and become comfortable enough to eat on her own.
Or it could be because she's sick but from what I gather that's probably the least likely cause of the problem right now.
You may have to seperate her from her cagemates. At least for a while until she gets a chance to settle into her new environment. Keep in mind you will need to seperate the male from the females in the future anyway so now may be a good time to some supplies and get the stressed girl out. Maybe when she calms down you can try and reintroduce her back to her cagemate. Sometimes animals just get stressed in new homes.
You could take a good look at the environment she's in. Is there a lot of traffic, noise, etc? Maybe try covering the sides of her tank (not just the feeding tank) so it doesn't look so open all the time.
I don't think 2 days is anything to be overly concerned about with food but make sure you get some water in her regardless of anything else you do.
Has she had a drink lately? You might want to go get some pedialyte to replace the fluids she has lost. I really think that should probably be your first step if she seems dehydrated or hasn't taken a drink since you've had her.
If she still doesn't eat in a day or two I'd start feeding her some mashed up pellets or chicken baby food by a syringe. If she's still dehydrated you can mix some pedialyte in there as well. Oh yeah, throw a little calcium in the mix while you're at it(just as you would dust the crix).
Hope this helps some. Forgive me if some of this is confusing. It's almost time to go home on a Friday afternoon and my brain is not functioning at full speed right now.
I you need me to clarify any of this let me know!
Good luck with your little guys! Dragons are just awesome pets!
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Rob Talkington