very poor diction - compounding problems of learning something new and complex.
"Does she know that you love him?" is marked incorrect here. I can't see why it should be, though. "Sa" could be he or she (or it), couldn't it?
Yes, It should be correct.
I am so lost... where is 'he'? isn't Sa means you?
Sa que lo ami ? Sa = he/she/it knows. lo = him
Did you report the problem to see if He, She, or It is correct?