PilgrimQuill
There's more to this than meets the eye. Two things spring to mind - firstly, she is single and 35, could there be a relationship issue or a health worry which is driving the anger? Secondly, such targeted yet diverse comments sound like the responses to an online questionnaire which she filled in for some reason unconnected with her mother. For a daughter to employ her mother in the first place there has to be a good relationship at the bottom of everything.
I think I would tell her I had seen it and been terribly hurt by it and see what the underlying explanation was before doing anything else.
Then offer to leave the job if that seems like a good idea and follow the advice already given to take up other pursuits and enjoy life elsewhere.
This seems sensible to me.
We all get irritated by our nearest and dearest from time to time and let off steam, but that doesn't make us spiteful, unkind or show that we don't care about them. There have been times when I have been frustrated, annoyed - even angry - with my children, my husband, my friends, and my mother. Sometimes fairly (IMO at least) and others less so - it's been more a case of lashing out at the people closest, or of a final straw meaning that I got things out of proportion. I think that's normal in families - they all do it to me, and to one another, too. Not necessarily out loud - sometimes people moan to friends, or to another family member, or, as in this case, write it down.
What you do about it, OP, depends on how the dynamics between you and your daughter work. What I (or anyone else) would do doesn't really come into it, but FWIW I would probably tell mine that I had seen the note and suggest we talk about it over coffee or something, preferably on neutral territory away from either of our houses. Whether that would work or not, who knows, but if you start with 'I come in peace' and make it clear that you are looking for solutions, rather than a winner and a loser, you should have a better chance of improving things than if you cut her off or go in all guns blazing.