It's good to see she's doing better. She definitely appears/seems to be in high/good Christmas spirit/spirits.
What should I use for the sentence to be as natural as possible?
She seems to be in high Christmas spirits. To my ear, "definitely" and "seems" are somewhat contradictory. CJ
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She seems to be in high Christmas spirits.
To my ear, "definitely" and "seems" are somewhat contradictory.
CJ
The plural is used in "high/good spirits". "Christmas spirit" is a different sort of spirit, and it is singular. It is wordplay to speak of "Christmas spirits", and there had better be a reason for it.