FWIW, I am a stay-at-home-working mom. I have to tell you--I have a lady come in once a week to do the jobs I just can't seem to get to like bathrooms, dusting and vacuuming (my job, keeping up with kids, clutter, cooking, laundry, homework, chauffering, etc. keep me more than busy).
It's THE BEST money I spend on myself. I no longer fret that in my crazy day I didn't get to those tasks and the peace of mind of knowing that the neglected things aren't constantly growing larger and filthier is worth a lot to me. Also, she can get the job done in a fraction of the time because she has no distractions.
If W is working full time and is stressed about the things she isn't getting to at home, perhaps the additional cost of cleaning services is worth the (hopeful) benefit to your R in terms of her no longer being able to hold the chores over your head.