My daughter was the same, not so much now, but can definitely relate.....my daughter is Def a bit OCD but I think a lot of kiddos can be! Does she go to nursery? If so ask at Nursery if they have noticed anything....but I would say it's something they grow out of! Apparently I was a bit OCD....and I can assure I am FARRRRR from OCD now! Lol XX
My eldest is on the spectrum and this reminds me of some of his behaviour at this age - however just one small trait like this doesn’t indicate anything alone. There are many other things that could be going on. And sometimes they do grow out of these obsessions/behaviours. I’d suggest it’s worth writing down a full list of behaviours that concern you and any lagging skills/areas she struggles with and then discussing with someone like a GP or a local support charity. There are lots of neurodivergency support networks around if you are concerned about that at all.
My daughter sounds the same! Despite having a love for swimming/water, over the summer she didn’t use her paddling pool because she didn’t like the towel getting wet 🤦🏻♀️ even though she baths every day and doesn’t mind getting that wet 😂 She’s just very particular and I think it’s more of a habit, but I found if I don’t give her too much attention she does snap out of it.