I try to help, but it's hard for me to write in English. I have to practice.
So I think that if tomorrow will have the second egg, she will be fine.
It is possible, that she is physically worn out ... because of her first egg.
You can give her more minerals (calcium) and vitamins.
I hope she will be fine. Please write me tomorrow. :
Your English is very good! Thank you for the quick reply. Today I as at work a long time, and when I came home she was sitting on the nest - so I can not see if there is a second egg. I will look tomorrow.
I am going to make her some scrambled egg and also mix in the egg shells from my chickens (thats what my young chicks like to eat).
The weather is very hot here - Thailand - so perhaps she is weak because of the temperature.
When she has hatched the eggs out I am going to let her fly around in my house to get more exorcise. May be she is just not got good muscles in her wings as she can not really fly around in the cage.