'Apprehensive'1 or 'Apprehend'2 may be the word you're looking for.
E.g. She was apprehensive about the next two weeks of the tournament.
Or "She became/came to be apprehensive about the coming weeks of the tournament"
Alternatively, "She came to apprehend the two weeks of a major tournament"
Though I tend to generally avoid the use of the word in this form as it can easily be misunderstood as the verb of a different definition
Adjective meaning to feel uneasy, anxious or fearful about something.