Ready to Estivate?

Hi, can anyone help me?

My Budgett's has recently become quite sleepy and stays asleep under her leaves most of the day. She's usually pretty alert in the day with her eyes poking out of the water, watching me but is choosing to hide and rest more recently. I thought she was trying to tell me she's ready to estivate however at night she has become very active, splashing a lot and swimming around her tank. She doesn't make any noises or seem distressed and has been eating fine. I'm pretty confused by her behaviour!