Taking Care of My Little One

I've been her Daddy for the past five years now. She's in her mid-thirties but likes to play little when we're together. We talk openly about our relationship and what it means to each other, making sure everything is consensual at all times. She loves when I take charge during our time alone, like dressing her up in cute outfits or setting strict bedtime rules just for fun. It's not something she does with anyone else, it's special between us. Lately though, she's been feeling a bit unsure about the arrangement and asked if it was normal to feel that way after all this time. That got me thinking too, I want her to always feel comfortable and happy. Am I doing enough? What advice can you give for making sure our dynamic stays strong and healthy?