What you shouldn't do is pretend not to understand.
disclaimer: She lives in the UK and I'm speaking from a US perspective.
Morally speaking I think the company is reprehensible. But nor do I think contact law should be changed because of it.
It is far more likely that an individual would do best to agree to a corporation's terms even if they favor the corporation than the other way around.
But the contract is being enforced from the US.
nit: this isn't generally a valid analysis. Rather, it's a common refrain used by people undermining freedom of speech while pretending to support it. This trope is often even trotted out in full-powertalk mode where it's applied to consequences coming from the government itself.
Does that seem like a free informed decision?
Looking at it another way, anti-disparagement agreements are basically bribes to keep quiet even if disclosure would benefit the general population.
One can still give up their basic rights if they so choose. The woman in question can cease from disparaging Meta for the rest of her life. A person can opt to enter in to being a slave to another for the rest of their life. I can choose to follow one religion or another or none at all. But one should never have those options taken from them.