About gall stones

My mum had her gallbladder out about 3 years ago, after losing a lot of
weight, 25kg. She goes to the gym regularly and eats ok, she is now
starting to put weight back on. She’s been told she has a fatty liver by dr
s but never how to fix it, or what that means for weight loss.
She still has about 20kg to lose to be at a healthy weight for her height.
She is on BP tablets, she’s 48 (soon)
Would a flush help her? Any other suggestions?
Thanks again for your help, you really are helping me heaps
Tan