Hello and thank you for using just answer. There really is no one specific thing you can do to make a woman orgasm as it truly depends on the individual. Also just because she may have an Autism Spectrum Disorder has no impact on her physical ability to orgasm either. May I ask can she orgasm through manual stimulation? And does she have an adequate sex drive or would you describe it as low?
Unfortunately I am not able to talk on the phone at this time. It sounds like you may be putting way too much pressure on yourself here. You have been trying for weeks but sometimes it takes a lot longer for certain women. There does not appear to be anything physically wrong either since she can achieve orgasm with her past boyfriend. It could be anxiety for her as well as she may be nervous or anxious. Try to stimulate the clitoris with the tip of your finger and through oral sex as the clitoris primary function is only pleasure. Give it time and remember even if she did not orgasm does not mean she does not enjoy sexual intercourse with you. Also try to introduce toys to your level of intimacy as these may help too.
You are most welcome. This will happen, it just takes some time as most women do not orgasm every time. Both of you should continue to try and explore different activities in the bedroom to help enhance the experience. I wish you both all the best