My mom was diagnosed with elevated liver enzymes, and she wants to know how to ease it, and how to prevent it from coming back. She's 55yrs old?

Find cause. Hopefully Mom got these repeated off alcohol, painkillers, and any meds she doesn't truly need. If still up, checks for hepatitis C and B, and Wilson's and hemochromatosis and autoimmune hepatitis, are all in order. This may simply be a way that her liver, with her genetic profile, asks for more exercise. Best wishes.