A working dilemma

I'm not really giving up cleaning for Lent [though I'd like to] because my  mom wouldn't have any help at work. My mom and I are kind of stuck. She is 71, but pretty healthy. Still, cleaning all day must be hard for her. She has to keep working because my dad's medications and medical bills run into the thousands each month, so she carries a Medigap policy through her cleaning company. These policies cost around $10,000 a year.  No work = no coverage. When she retires - so will I [from cleaning, at least]  but she is trying to last as long as possible [ and so am I]. Sometimes I wonder how long I can continue to clean for a living, it's a peaceful job but very hard on my body. One of the reason that my house is messy so much is that by the time that I get out of work my energy is far past spent. They say "Cleanliness is next to Godliness". Not so. At least in my case. Would it be better for me to keep my own house spotless? To do that I would have to give up working and my mother would have to work twice as long. I've weighed the two - my illness against her age- and so far her age wins. Her knees are pretty spent from all these years of working. She raised 5 kids through thick and thin and her knees and hands bore the brunt of it. She barely ever complains though I know that she has to get up 2 hours early for her muscles to warm up enough to work. She tells me that God gives her the grace to continue and she is going to work as long as possible. As for me, I'm not sure how much longer I can last doing this. It leaves me in quite a quandary. I have been praying for God's will in this area but I am having trouble discerning it. For now, I am just leaving it in His hands. Things tend to work out on their own if they are placed there. But if anyone has any helpful advice, I'm all ears :)