Cat suddenly has a curled tail all the time

Not sure if this is something to be concerned about but my 9 month old cat has recently gone from normal tail to constantly having it curled round like this. I don’t know if it’s normal, when I google it there’s mixed info so thought I’d ask here if this warrants a vet visit as some say it means they’re happy, others say it means they’re in pain. She’s still running and jumping around so I don’t think she’s in pain but I’m just not sure why it’s all of a sudden she’s got a curly tail that only straightens when she sits or lies down. We love and worry about our cat like she’s our child, so sorry if this seems like a silly thing to ask about!