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Should I have? Is this an autistic thing to wonder?
If you do, and want her to know, then yes say it.
Does she say it to you?
My family never really said it to each other. It just wasn't normalized. Then one day I started thinking I may not have them around forever and I wanted to tell them. So I did. Mostly "love you, bye" when ending a call. And they were a little weirded out at first, but said it back. Now if I wait a beat before saying it, they'll say it first!
I don't like to say it to anyone but my partner and my kids.
I like to show it though. And let's be honest, does saying it really mean that much, if you don't show it?
It depends entirely on how you both communicate. I haven't said it to my sister either and didn't realise before reading your post. It's all fine as long as you have a good relationship.
If you love her then yeah you should tell her. You never know what tomorrow holds