Sign of autism/OCD or normal behavior?

I guess I’m just being a concerned crazy first time mom, but my daughter is 16 months and recently she’s been in a very repetitive phase when it comes to playing. She will sit and put all of our coasters in my boot, then remove them one by one, then do it again over and over.

She will want to be up in a chair we have that spins and then want all of her toys in on the chair, then spin around, then push them all off, then do it again.

She just very repetitive with most of her play in this way. Everything has to be done a thousand times and she loves setting things in things and taking them out and such.

She is also not walking yet at 16 months and didn’t crawl till 12 months.

However, she is very advanced in speaking. She uses 3-4 word sentences already and knows about 40-50 words. She can make all he animal noises, knows her body parts and is beginning to get colors as well. She is also very engaged with other people, but doesn’t care for playing with other kids at all.

Not sure if this is just normal behavior or the repetition/not walking yet is something to be concerned about as an early marker for autism or such?