Don't ask her.
I don't know if it is possible to have all three.
After losing my second baby I joined SANDS and got to know so many people who made the 'choice' to terminate babies they desperately wanted because there was so much genetically wrong with the doctors had said they would not survive to full term or survive birth.
I know what CailinDana means when she says " Basically a child with that level of genetic abnormality wouldn't need to be terminated as they wouldn't survive and I'm guessing they wouldn't develop at all in the womb" but when some parents are told their baby has so much wrong and will not survive for much longer they feel they are doing their best for their child by terminating the pregnancy rather than waiting for their baby to die as the overwhelming emotion is that if your baby cannot be helped you don't want to prolong any suffering the baby my be going through because of the condition. It's a horrifically painful and unselfish choice for a parent to make.
And I know from personal experience that when you are given bad news about your baby, and doctors are telling you all sorts of things, it's very difficult to get anything straight in your head beyond "your baby has died" or "your baby will most likely die very soon." Everything else becomes background noise and it's easy to get confused.
So as the others say, she may be confused about what was said to her and genuinely believe her poor baby had all three conditions.
Bereaved parents often like to talk about their babies and their experiences, but not questioned in a way that might be hurtful. This mum may already be feeling very sensitive to any criticism of her 'choice' (for want of a better word, as these terminations usually happen when the parents feel every other choice has been taken away) and she may be alert to any questions that sound critical or disbelieving.
If you are concerned about trolling then it's best not to call it out on the forum, it will inevitably lead to other people getting dragged into an argument as they either try to defend her or out her. Flag it up to the Mods and let them do their job.