If you want total coins, then:

146 + 812 = 958 coins

However, if you want total value...

If we consider all gold and silver coins to be roughly an ounce, then we have 146 ounces of silver and 812 ounces of gold. By today's standards, gold is worth $1078.90g (g = ounces of gold) and silver is worth $14.23s (s = ounces of silver). Simply plug in the numbers and then add it all up.

Gold: $1078.90*812 = $876066.80

Silver: $14.23*146 = $2077.58

$876066.80 + $2077.58 = $878144.38

Zoe has $878,144.38 in precious metals. In other words, she's freaking loaded and can retire happily as long as she invests wisely in the correct companies. Poor usage of her money will lead to her being penniless in a matter of weeks and she will be homeless and lamenting her fate.

EDIT: I've just realized this is my 250th answer. Oh joy.

We are all from diffeerent countries here and we have different currencies so how could we possible know what a silver or a gold coin is worth?

TRUE!!!!!
 

u spelled one of the coins wrong they are not spelled like this:cions

she has a total of 958 coins.  It did not ast how much they were worth it asked how many coins.

The origin spelling mistake was a mistype what is your excuse.  

u is a letter not a word :/

Oh, and @Melody there's a general gold standard that is used through the world, and the price of it is tracked.

And since I apparently can't edit my older post, all currency values are in US Dollars (USD). If you wanted to find the value in other currencies, simply convert the final value ($878,144.38 USD) from USD into whatever your preferred currency is.

Good spotting Guest 4     

I really need to wipe the mud off my glasses.