Poor Sooty

Every day I keeping wondering will it be the last time i feed her? Is it the last time I help her groom her knotted fur? Is it the last time I give her some pain relief? She barely has enough room to swallow anymore yet she's wagging her tail for milk and tuna, she can smell it mile away. I just wish she would give me a sign she has had enough......feeling sad today that this might be the week, but then I felt like this a few weeks ago and then it passed. Is it torture for me waiting or is torture for her letting her go on? Oh the guilt is dreadful...........I feel so sorry for her and this dreadful tumour taking over mouth and ability to even groom anymore