How fast does frontal lobe dementia progress?

My mother has been diagnosed with Fronatlemporal Dementia since age 60. She is now 65 and is becoming very intrusive to people and childlike. She has trouble with word comprehension and I do all of her billing etc. She still is ambulatory, but doesn't wash clothes properly and her house cleaning skills have diminshed. We aren't sure if we should go the nursing home route yet. What should we expect down the road? Will she be mute or incontinent. It is such a strange disease. I forget what she was like before the illness. Thanks for any input.