Grammatically you are right, but in a formal sentence I would never use "voglio". (it's unpolite and stands in contrast to the "polite form" La)
Vorrei assolutamente incontrarLa. sounds better.
However, the whole sentence sounds odd, I would write:
Voglio assolutamente incontrarla.
(In Italian it's more used to put the object pronoun together with the infinitive).