Did you get them from a breeder, or from a shop?
If she can't fly it could be the lump causing distress what colour is her cere and is it flaky or raised? If possible please post a picture of her front on. Also what are her droppings like? Are they normal or larger, watery, I still feel they should go to see an avian vet .Also you said you placed them in the aviary ,when you bring any new bird home they should be quarantined in case of sickness that can be passed on to your other budgies.
Please get her looked at as soon as possible.