@mahdi123, I know that you must be frightened and confused. I am sorry that your sister has liver disease and the symptoms. Like her, I am a patient and I do not know the answer to when the doctor will determine when to send her for transplant testing. The symptoms that your doctor are all listed in this link that I want to share with you. I hope that you find it helpful as your sister wait for the next step. It can be a long slow process, so reading and learning will be to your advantage as you and the doctor take care of your sister.
https://www.mayoclinic.org/diseases-conditions/cirrhosis/symptoms-causes/syc-20351487
Is her doctor doing routine labs? That is how my doctor knew when to send me to the transplant center.
When is her next appointment? It is okay to call the doctor in between appointments when you have any concern.
Do you live near your sister?