More often than not there is no advance notice and the bird simply lays the egg. Assuming that she is stressing, siphoning her tail and breathing intensely, this is an indication that she can't lay the egg and this can be deadly. On the off chance that you have a Vet arrangement, it's smart to keep it. In the event that the past proprietors let her lay eggs frequently, she might be in chronic weakness hence. What
Do Parakeets Lose Tail Feathers Before Laying Eggs?