I can only imagine what you are going through with your Mom. And my heart goes out to you. I also respect your decision not to apply any more chemo treatments. These can be devastating.
I am not experienced in caregiving, but I hope you do not mind my responding from another perspective. I have NHL (Waldenstrom's). Have had it for about 5 years and have experienced 2 years of complete response to non-chemo type treatment. There are numerous non-chemo treatment drugs for NHL currently available (e.g. Rituxan, Velcade, Bexxar, Zevalin, Decadron, Thalidomide), and many others that are in clinical trials. Most of these are reported to have minimal side effects, compared to the classical chemo treatments. If you are not completely resigned to no treatment of any kind, you may want to check into some of these.
May God bless your efforts on behalf of your mother and may He provide wisdom, comfort and strength in the trial that all of you are bearing.
WWH