If you were single, it would be appropriate to tell her how you feel, and perhaps even discuss your ASD with her, but you are married so it's not appropriate.
I have had similar problems, where I have gravitated towards others, and not found it reciprocated - male and female, and sometimes (with women) I have felt attracted, but not acted on it.
I have been bitterly disappointed on all occasions, as I realise the way I come across is intense, and this puts most people off.
The only thing that you can really do is keep it professional with the girl at work, and make sure you're not leading her on.
You could do worse than to tell her about your wife and family life - this will help set boundaries if she had been interested in you, and let her know you are not interested in "that sort of relationship".
I've been known to use that strategy from time to time, and although it may feel a bit difficult and contrived, at least it reduces the chances of being unfaithful with one's wife, and is more honest than developing crush on a female co-worker which could be seen as stalking, or seeking an affair outside your marriage.