May I ask is your mom's tumor is in the liver or outside the liver?
Is surgery possible? If not, why not?
Did your mom have an interventional radiologist consult to see what the radiologist can do for her?
How much the tumor shrunk and is it just one tumor or a few more.?
You should explore the above options--radiology if surgery is not possible.
The way that you mentioned about the shrinkage ( if>25% overall ) is good;otherwise it may just mean partial response or the tumor is stable .
The word you used "a littlebit" make me think your mom's tumor is stable at best. If so ,2nd opinions on oncology and radiation at Emory hospital at Atlanta may not be a bad idea.
I am a patient of this disease for 49 months now, it is a winding road with twist and turns. No one knows the exact time we will depart, but with knowledge,and good medical consult by doctors who specialized in this disease,will be essential in helping your mom making future decisions.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.