Advice/Support - I think my adult sister is autistic

HI Everyone, 

Just joined the community and first time posting. I am looking for any advice or support from people who may have had to have a conversation with an adult family member about them being possibly neurodivergent? Anything is welcome as I am piecing this all together. 

I'm 32, my sister is 28. She has always been herself and it isn't unknown among our family or friend circles that she is unique. She's just been fired from her job and I am trying to navigate how to have a converation with her around seeking medical advice/support for a possible neurodivergent diagnosis of some kind. I know on the one hand it may read as harsh that I am looking to raise this after her being fired, but a pattern is emerging somewhat in her employment history and I am trying to help by working out how to break this.

I used to work with a woman who had aspergers and the parallels between her and my sister are notable which has put me on to posting here.

Any advicce is hugely appreciated and happy to provide further info if it would help

Best

RS