My advice would be to make a list of the reasons you feel you’re autistic and bring it with you and then just try to slip it into conversation.
"Oh, by the way, I’ve been doing a lot of thinking about something and I wanted to share it with you…" and then explain and present her with the list, maybe?
Another option would be to find the dsm criteria online and then note down what parts you think you fulfill and why. This might be a good option if you have trouble organizing your thoughts enough to make a list by yourself!
If anyone else has advice please feel free to add on.
Good luck, Anon! c: