How to deal with dva?

So she is so weird to me, im unable to confirm a pick, cant damage her cuz she stands there with dm for half of the game, and gets so much healing that killing her is only viable if she does something really stupid.

I'm a DPS player Just had this game, wide q low diamond-masters2, crazy q and that dva just won the game by herself, and he was the master 2. But what she would do is get on high ground and literally sit there with dm and poke us, nobody wanted to contest so rest of team just pushed easily pretty much entire first point, after it got more normal but that lead definitely big deal, and rest of the game insane dms, and dont think i was able to try get a pick without her running around me, how do you beat good dvas?