Tanya in season 5

Hi i have a huge question about tanya in series 5. I don't get something about her coming back from Brazil. When she comes back she says she is a major shareholder of EP. But how can that be since she gave all of her shares to amber before leaving England when amber and conrad found out she had switched the babies. Also, what happened to Amber's shares in the club since she ended up crazy ?
I know it sounds weird as its is not that important but it kinds of bother me not knowing lol.

Also, is garry the new chair Hazel chose ?
Does tanya die in the last episode?

Thanks

I wondered that too. I came to the conclusion that Tanya bought up her shares with her dead husband's money when Amber went to the looney bin.
I also, choose to believe that Tanya out smarted Gary, even though it was implied she died.