I'd skip "się" and reverse the word order. "Żegnała za często" sounds better and more poetic ;) If you want to include "before" (which Lating skipped): "Żegnał

I'd skip "się" and reverse the word order. "Żegnała za często" sounds better and more poetic ;) If you want to include "before" (which Lating skipped): "Żegnała już za często"