She's looking good!
The sudden growth is normal after flipping to 12/12, usually happens for 2-3 weeks max and then slows considerably or stops all together.
A word of advice if I may. Now that your in flower it's usually best to aim for less than 60% humidity, and if possible between 45-55%, and late flower 35-40%. Are you running an exhaust fan or just circulating fans inside the tent? An exhaust can help tremendously with humidity and cheaper than dehumidifier (usually).
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