Was it an attack of viral hepatitis?
What were the levels of ALT? And what was bilirubin
AST and ALT levels of more than 3 times the normal levels are only considered to be significant.
Mild elevations can be seen with any infection, certain drugs etc.
In a case of viral hepatitis, ALT levels may take 8 to 12 weeks to normalize.
If she is otherwise normal with good appetite, normal food intake and normal activity, you need not worry.
All the best.