Liver enzymes after a liver transplant
is more complex. First of all it would be important to know if your mother was infected with Hepatitis C
prior to transplant, as the virus comes back 100% of the time with a new liver, therefore it can cause liver enzyme elevation. The fact that she is 3 months post-transplant makes someone think also about organ rejection, therefore the immunosuppresive medications might need to be adjusted. Also there could be "technical" issues with the bile ducts, or if the donor liver was not in good condition it could not be functioning great. Liver enzymes elevation after transplant is not normal, and usually requires a liver biopsy
for a final diagnosis.