Firstly you have no life steal so in a team fight you will die. With a crystal build like this you would need to get Eve of Harvest. However for this build to work you need the items that you have given but for the life steal to work properly (have your health basically stay where it is or even go up when using Red Mist when 3 enemies are attacking you) there has to be at least 40% life steal which would be using 2 Eve of Harvest which would mean you would have to not have one of your lists items so the build would be rubbish. That is why Rona is actually a very difficult character to play very well as she requires a hybrid build which is difficult to play with unless you know what you are doing (which it seems you don't. Sorry but it's true). Also for any crystal build you need to have shield pierce which would stop you getting anything from this build if you didn't get it.
Also you should never buy defence items earlier than fourth unless you are playing support.
If you want a proper build for Rona that works look at my guide called Rona WP/CP hybrid assassins build and please like!
I'm being helpful not just advatising
my guide.