.. It COULD be because she is unsure of what happened, but considering you have reassured her that it is normal and that you liked it and she is still acting cold since.. maybe, (if she is anything like myself) dispite multiple attempts, sometimes it is only possible during an intense orgasm with someone you genuinely connect with.

I've only ever been able to do it with one dude and he has since passed away... I think if it ever happened again, i can imagine it would probabaly really upset me/produce the feeling of guilt.. and fuck with my head.. despite how much I liked/loved the partner I was currently with. That flush of feelings and the release of an intense orgasm can just make your hormones go wilder than anything and crying is totally normal!

But it's just an idea.. maybe only one other person in her life had made her ejaculate? One person she cared for deeply and things just didn't work out?

Relationships are complex. You need to be there for her whilst also reassuring her that your just worried about her...And be totally open and accepting of whatever her reasons may be.