Half sibling pressuring me for DNA test??

I have a awkward situation on my hands.
I have a half sister who has never contacted me in 40 years.
Now out of the blue she calls me and tells me she has an extra 23&ME DNA test that she is "offering" me for free.

Turns out our uncle is about to die and has a million dollar estate. I heard through the grapevine she is suggesting I am not my father's son. This is absurd because of all the family I look most like my father and not like my mother.

I feel giving her a piece of my mind but I suspect she is conning my uncle that I am not his relative.

And you thought your family was bad.

Any advice?
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