This behavior paired with the nose rubbing and regular yawning you mentioned in your last thread about this definitely screams respiratory infection.
Snakes rest with their heads up, exactly like in your pictures, when they have respiratory infections. While Boas will often just sit and stare upwards, it is not normal behavior for a ball. If you had no other symptoms, I wouldn't be as concerned, but since you do, I'd say it's time to take her to a vet.
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