The best advice that I can offer is that you need to sacrifice your pride without sacrificing your self respect. Do not say bad things about her to your husband or others, do not say bad things towards her. Treat her with the utmost respect. If there is a quarrel or issue that is not of a life-or-death nature, defer to her will if it makes her happy.
Did you know that Harry S. Truman, the President of the United States, was never loved by his mother-in-law? She did not like that he came from a lower class, she too thought that he was taking away her baby. She did not approve of him fighting in WWI, she did not approve of him going into business or into politics. Mr. Truman lived with his mother-in-law for 15 years, starting the day he married, until he was elected to the United States Senate and moved to Washington, D.C.
Until the day she died, President Truman never said one unkind word with his mother-in-law, or even disagreed with her. How about THAT for true resolve? One of the most powerful people in the world, the man who dropped the bomb on Japan and felt great sadness over it, could not bring himself to even tell his mother in law to shut up!
If you are a Christian, the Bible tells us to pray for our enemies, and God will change their hearts. Pray for your mother-in-law. Don't pray that she likes you, don't pray that she changes her heart, but just pray for her. Keep her in your heart and your thoughts kindly and with love. God will change her.