Sad to read about that tough diagnosis. My thoughts on complimentary or alternative medicine are that, if you still wish to combat the cancer, it should be used as an addition to standard care, not by itself. Also, it should be discussed with the doctor to make sure it doesn't interfere with any treatments. Use their Hippocratic oath-- first, do no harm. If you're going to suggest herbs for mom, then discover later on that they cause more harm than good, that wouldn't be fun.
I have considered complimentary and alternative medicine for my dad who is also dealing with a stage IV cancer involving a secondary liver cancer, and I'm still open to it if there's something with a solid history of results. I don't have much time or willingness to turn my dad into a guinea pig and experiment with various things. But if there's something that makes sense, I will definitely look at it and talk with him about it. If it was my own body, I would be more open to experimentation because I would be in control of the whole picture, including diet, and I'd approach it differently. Whereas, with helping dad, I'm concerned with his concept of quality of life and his wishes, what makes him happy. Sometimes healthy food is whatever you can get someone to eat. Chocolate cake can be good "right now" medicine.
One glance at the internet reveals that the snake oil salesman business is still alive and well. There is an abundance of books, supplements, ointments, and cure-alls on the market, that are really garbage. On the other hand, if you can afford it, there are also doctors who integrate complimentary and alternative medicine into their practice. Someone who makes it their lifelong discipline, and who also has an education in understanding the human body, may be in a better position to offer advice and save a lot of time. I don't have the funds to go down that road.
Here are a few information sources on complimentary medicine from the mainstream.
At the point where your mom has jaundice, I think the tumors may be interfering with her bile ducts. If there's no direct involvement with the bile ducts themselves, then the pressure has to come off of those bile ducts. If the jaundice is causing discomfort, one thing they do sometimes is insert little tubes or stents that allow the bile to flow normally, depending on what's happening with the liver.
Dad has edema in the ankles and feet also, that was pretty bad at one point. We found that by making sure there was adequate protein going into the diet, and by elevating his legs when he's sitting, that it helped with swelling. Protein helps to hold the fluid in your vessels, and low blood protein can cause that edema around your lower legs.
Best wishes for you and your mom's health. Is she able to eat well?