I assume that the stronger is Israel and I further assume that by strong, He is speaking of physical or military might. I assume this because the “older [Esau] will serve the younger [Jacob].
why then am I this way? The gist of what she is asking: If I am OK and there is nothing wrong with my pregnancy, then why am I like this, with all this tussling about inside of me?
went to inquire of the Lord - It doesn’t tell us how or where she went to inquire.