We may wonder why Mary set out and went as quickly as she could to see Elizabeth.
Given the travelling conditions at that time, it was certainly not an easy or smooth journey.
Besides she has just conceived and it would be better for her to rest and take care of herself and her health.
But the blessing that she received at the Annunciation was so great that she wanted to share that blessing with Elizabeth, and also to share Elizabeth's joy of pregnancy.
The gospel passage is indeed about the joy of God's blessings.
The 1st reading is also about the joy of God's blessings, which is described as shouting for joy, a rejoicing heart, with no evil to fear.
The 1st reading even describes how much God wants to give His blessings: He will exult with joy over you, he will renew you by his love, he will dance with shouts of joy for you.
Yes, God is so eager to give His blessings on us. We just have to ask and we will receive.
And when we share God's blessings with others, as Mary did, then we will receive blessing upon blessing.