It means that we still don't know enough Rumanian to make difficult, linguistic complicated sentences and we have to work with simple (but strange) sentences ;-)
What does this sentence mean? Does it mean the girl isn't poor?
It could mean she doesn't have a daughter who is poor, or she doesn't have a household female employee who is poor.
The audio is not comprehensible
A nice comment to say to locals as you practice your romanian
Why is "She hasn't" not correct?
Because that form of negation is only correct with perfect tenses in American English, which Duolingo is. "She hasn't seen a poor girl" would be correct, for example.