I've had her two, three weeks now?
I'm really not sure on age. But looking at the photos in the Members Gallery she looks smaller and leaner than all of them.

New plan of action, if there's no objections;
I'm going to feed her for the second time today, right now. Then I'll do daily feedings until she either begins growing or fattens up a bit - at that point, I'll re-evaluate her feedings again.
She eats fine with no one else around, so my hope is to get her at least a little better fed before she gets her two new tank mates - just in case they're capable of taking all the food.