Definitely don’t focus on the problematic stuff and use it as an explanation, or wait for a meltdown and try and tell her that she’s only feeling that way because autism!
(Friend’s dh basically did this, after leaving all the parent workshops to his dw and caused havoc with their teen)
I know that’s stating the obvious but it actually is important to get your head around the concept of autism before you try having the conversation. When we’re thinking about our dc possibly being autistic it’s framed as the “something wrong”; the explanation for the bad stuff. But it’s much more than that.
Really delve into the positive side if you can - I don’t mean twee super power stuff, but if your dd is autistic, this is her neurological wiring. It likely is a huge part of why she’s good at fitting in, making friends and figuring stuff out. It probably plays a part in the subjects she excels at and in her interests.
And if she is autistic then the apple probably didn’t fall far from the tree so think about that too. Do you have traits, or did you fall in love with someone who did?
It’s hard if you dont have a certain answer yet, so maybe you need to handle this with a mild curiosity at this stage. It’s just a question to answer.
My ds was diagnosed at 3 and young enough not to really notice or question, so I had time to come to terms. It’s much tougher when they’re older and it’s important that you look after yourself in this process because she’ll need a lot of reassurances and support. Do you have RL support? Could you afford (or find) a counsellor to talk with?