The most common and most likely answer to this crossword clue is the 10 plus 1 letter word PESSIMIST} –
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Buddy explains!
The straight part
We know that "She doesn’t think in a positive way" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case she doesn’t think in a positive way = pessimist} –.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PESSIMIST} – mean?
PESSIMIST} – noun- Someone who habitually expects the worst outcome; one who looks on the dark side of things.