"She tries watching television."
Translation:Ella intenta ver televisión.
These are a couple of the lists showing infinitives using preposition 'de' + others
I think the English should be "She tries to watch television." (not watching) if you want to see if the person knows conjugated verbs are followed by infinitives but if the sentence means, "She tries (while) watching the television."then that is a different meaning... and "Ella intenta mirando la television." What she is trying to do is unknown but she does so while watching the tv.