"then you shall send her on her own": but not to the house of her god.
"then you shall send her": with a divorce (a "get"), as per R. Yochanan. "on her own": If she were sick, he must wait until she recovers — a fortiori, for Jewish daughters, who are holy and pure.
"you shall not sell her for money": This tells me only that he may not sell her for money. Whence do I derive that he may not give her away as a gift or as a gratuity? From (the superfluous) "and sell you shall not sell."
"lo tithamer bah": You shall not use her. Variantly: This is an exhortation for (the observance of) everything mentioned in this section.