Lovely idea, totally unrealistic.
I'm desperate to re decorate, despite running a construction firm, having all the necessary skills, tools and free materials, it is impossible because neither of us have any time, and the time we do have we choose to spend on the children, I could get our decorators in, but the upheaval would be ridiculous.
Suggest she tackles a small room on her own during the day, and do one small space at a time, but adding another demand to the limited time you are at home will just causes problems.
Maybe the next time you have a break from full on work, you could plan to do a space, set a plan, so at least she has some sort of realistic future solution to look forward to.
and get a few quotes, you may be surprised, especially if she does all the prep, stripping, sanding, filling. There may be some middle ground, if she does the prep (about 60% of the work)
Everyone gets fed up of their space if they spend to much time in it, sounds like she needs a break.
Oh we both work really long hours, that never excuses either of us mucking in when we get home, if you lived alone, you would still have to cook, clean and all the other household tasks, so make sure she isn't compensating too much for your long hours, that never works long term.