You are not children any longer - parents do not have any power over you.

You don't have to pay their advise any more attention than if it came, unsolicited, from a neighbor (and that would be rude of them to give you advice unasked for)

This works but only if you don't go to your parents with your troubles expecting help, and don't rely/need your parent's approval.

Oh man, it's not quite the same, but my in-laws LOVE to give us TERRIBLE advice, especially financial advice. Thankfully my husband has come around to seeing that they don't know what they're doing and so we just nod and move on and do what we want. But honestly, it took awhile for him to see. Even though they have massive credit card debt, minimal retirement savings and a unique ability to justify why they need to buy a 3rd car when they already have two well functioning ones. (It was a good deal was the reason...which...uuhhh, what?!). They also took on my SIL's massive credit card debt, mostly I think bc they are so proud of her for following in their footsteps.

I am dreading the day they can't work and realize that perhaps instead of accumulating cars, they should have been accumulating retirement accounts...

Stop fighting, stop engaging.

Don't participate in the conversations, tell her you appreciate it but if you want her advice you'll ask for it, stop giving any fuel of any kind (including any emotional response) to the conversation. Literally walk away or refuse to see her if necessary.

"Mom, I've told you repeatedly that if I want your advice I will ask for it. I don't want to discuss my career or hear your opinions. If we can't find other things to discuss then I'll simply not come over (or call, or invite her, etc...)."

"That would be terrific but they don't offer that in my field/specialty /office anymore"

I don't think a relationship with Grandma is worth putting up with what you're putting up with.

Time to scale back and get some therapy. Your mom sounds crazy.