Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
The symptoms your sister is having, along with increased ammonia levels suggest that she is having hepatic encephalopathy
For treatment of HE you should know the factors that leads to HE in stable patient of cirrhosis like overuse of diuretics like lasix or spironolactone
if she is on them, Gastrointestinal bleed, low potassium levels, medications like benzodiazepine
, low sodium levels, infection, constipation
Treatment is correction of the precipitating factor
I will like to advise that you should visit a gastroenterologist before the thing worsen.
I hope I have answered your query and this will help you. Remain in touch