Because ‘ide’ really means ‘to here’ (or ‘hither’ in archaic English), even though it's usually abbreviated to simply ‘here’ in modern English. So ‘itt’ says where someone is, while ‘ide’ says where someone is going to.

The problem is that there is already a verb "vár" means waiting. Note it doesn't mean a castle in this example.

So you either say "A művésznő itt van" - The artist is here or "A művésznő itt vár" - The artist is waiting here.

Why not?
müvész' = male artist; múvésznö = female artist