I think she shouldn't have written in at all .
Just keep it to herself.
If the seller wants to sell in a hurry , they will accept any
terms. They are at the loosing end but hey nothing personal , just
business. If the seller can afford to wait, the buyer is at the
loosing end .
That is how you play the property market . Take it or leave it. I
know of some who just force the hands down ....take it or leave it
because I can go elsewhere to do this business. Nothing unethical
about that especially when a person is forcing overzealous
investors who overplayed their hand and need to lose the liability
fast.
That's what my relative did to a developer. Told him to either take
the money and absorb the taxes in or else off somewhere he
goes.