She's probably just fine and might be seeking attention as stated above but another thing to consider is you don't have to be on the spectrum to enjoy certain sensory aspects of things. Do you remember twirling as a child or even having your parents swing you around. Twisting the swings instead of swinging on them. To each person different motions feel good. She might actually enjoy the dizzy feeling. I know sometimes this can become annoying in certain situation but if this behavior doesn't disappear when you ignore it try teaching her when it's OK to spin and when it's not and provide other sensory appropriate fillers in the times when she needs them. Everybody has their own vices and as they grow older learns how to regulate them appropriately.

It's unusual for an Autistic kid to START spinning at age 6. So I think there's nothing wrong with your daughter but she's trying to get attention or she's imitating your son. Certainly spinning on its own is not enough for a diagnosis. If that's all that she is doing, I would just ignore the spinning so she's not getting any attention for it, and see if it passes. Also I would start giving her more attention when she's not spinning. And immediately wander off if she begins spinning so it's really clear to her that she will get no attention when spinning. Don't even comment on the spinning. Our NT kids at that age really try hard to get attention because their Autistic siblings get more than their share. You need to think this through and figure out a way to have special times with your daughter. Also start talking about Autism with her. There's some great childrens books on the topic. Let her know that she is special as she is. And how hard Autism is for both her brother and the family.

That sounds like what my OT lady told me yesterday. We were talking about people who have to chew gum or jiggle their leg, etc. I have always been a foot tapper or leg jiggler, pen clicker, etc. I enjoy rhythm. That must be a fascinating topic to study!

That is the greatest advice! Makes perfect sense. THANK YOU! The poor thing is a middle child with an older daughter having ADD and having issues, and a younger brother with autism. (plus a baby brother who demands attention just cause he's a baby) One day she asked me, "so what do I have?" Isn't that a revealing question? So I have had to talk to her that she does not have to HAVE something to be special or important. She is perfect the way she is. I think I'm going to have to repeat this often and maybe show her (not just say it) by doing special outings or something focused on her. I want to find a book like that, I'll have to google it.