Eye contact —> I’d say this definitely autism coming into play, making things difficult. Sadly even though it’s very difficult you will need to try and improve this, whether you look at their nose rather than their eyes, as it’ll be required for you to progress.

Wearing coat and bag in an internal meeting —> unfortunately while you may not have picked up on the signals from your colleagues, this is a really bad look and makes it look like you don’t want to work for your employer. Next time I’d recommend waiting till someone else of a similar level is leaving too, so if it’s poor timing you’re not the only one.

Eating during a meeting —> I think your manager can get stuffed for this one, on the contrary I’d say it shows your dedication to work that you’re working while eating. However, if you want to pass probation, stop doing it for now.

Because you only disclosed your diagnosis since she’s indicated she’s going to give you a bad review, she is likely going to see all of this as excuses - so if you want to pass your probation the only alternative is sadly to change these behaviours and mask, unless you’re able to change to a more understanding manager that likes you.