Right, that time period is generally meant for hospice care, whereas palliative care isn’t looking at prognosis (how long to live) the way that hospice does.
Instead, palliative care focuses on quality of life, however much time might be remaining, whether a long time or not, and not “harassing” the patient with a lot of tests and treatments that really wouldn’t improve the quality of life.
Edit to add again: and I’m sorry again about your mom. It can be shocking to see changes like this, and often so distressing to the patient who knows that something is wrong, but doesn’t know what.