Hi Hayley, from what I could gather from the info of your grandmother it seemed like she pressures you to get a husband and this makes you feel bad? Unfortunately I can’t say that God wants you to be single however looking at the golden key it seems like it is more about being pressured to get a husband than what God’s plan is for you.
The baby represents either responsibility or obligation (what related more to you) but the responsibility or obligation is more the feeling you are experiencing when your grandmother asks you when you are going to get a husband.
Hope it clarifies your questions. If this is something that is on your heart maybe God is calling you deeper, best is to pray and ask God all these questions that are on your heart, He will answer.