Translation
and it came to pass that, as ELIZABETH heard the greeting, the baby leaped in her womb and ELIZABETH was filled with the Holy Spirit,
Paraphrase
And here is what happened: At the same moment that THE ONE WHO HAD BOUND HERSELF TO GIVE ALL ALLEGIANCE TO HER GOD heard the greeting, the baby in her womb reacted with every part of its being. Then THE ONE WHO HAD BOUND HERSELF TO GIVE ALL ALLEGIANCE TO HER GOD was filled with the Holy Spirit,