' ' is what is normally said. To use "at", you would have to have a situation in which she is in the area that the field trip is taking place but she is not taking part in the field trip.
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'Is she on the field trip?'' is what is normally said.
To use "at", you would have to have a situation in which she is in the area that the field trip is taking place but she is not taking part in the field trip.