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I understand that the situation of your sister is sad. As she is diagnosed with liver failure
, which is a life-threatening situation, the very first thing to do is to care for the mother.
is the first step to take in this moment as no therapy can start while being pregnant. She is only 12 weeks pregnant, where the organs are not formed well, so, abortion is less risky.
Usually, there is consultation of a group of doctors (including GI and OG specialists and others) before running into the conclusion of abortion.
She is young and after "defeating" liver failure, she can get pregnant again.
All the best to your sister and all of you!