Take another look at the sentence:
The blank space between row and because is completely correct. Jackie always made it a point to sit in the front row is a main clause. Because she liked to focus on the lecture and take good notes is a subordinate clause; it needs to be connected to the main clause that comes before it. When a subordinate clause follows a main clause, you usually need no punctuation between them.
For future reference, you should remember that 99 percent of the time you will not use a comma before because. It is a common mistake that is easy to avoid.