What do you do when you find out your mother has been talking badly about you for years to your relatives?

My mother has relatives in Trinidad that I had never met. Then because of facebook I started keeping contact with them all and became close to one cousin. She and her family came to stay with me and my family and when I told my mom she did everything to try and discourage it. After sometime visiting with me, my cousin admitted that my mom had been talking badly about me for years to all our extended family but she thought I was nice and didn't see any of it. She even let me listen in on her conversation to her mom where she told my mom how she couldn't see any of the things my mom said about me including that I'm fussy and germaphobic and several other untrue things. The funny thing is I thought my mom and I were very close and I told my cousin that before she told me all these things. My mom calls me several times a day and comes to visit a lot and always tells me what a great hostess I am etc. She kept telling me how much she would miss me on her last trip to Trinidad where she apparently talked horribly about me. So either my mom is lying to me and really dislikes me or she is lying to them. She told them among other things that I call her all the time and too much when it's the other way around. But I didn't mind because I thought we were close. Needless to say all the things she said are horrible. My husband and I are in complete shock. She's always been so nice to me. I don't really want to believe it. Now I don't know if to carry on as if I don't know and distance myself from her or if I should tell her I know. The things she said about me are just not true. It's like she made up these tales to entertain family or because she may have been jeolous. My life is pretty great, I have a great husband (who has a good job), a beautiful son and home and we can afford a nice life so I don't have to work and I have lots of friends and I think you could say I'm nice enough looking. I'm no model but people say I'm pretty (although I wish I was 20 pounds lighter) Anyway, my mom always tells me that she hopes I know how lucky I am. So I wonder if this was her way of getting back at me. I really don't know because she is so nice to my face. All this is a total shock to me. Anyway, any advice would be greatly appreciated! Should I distance myself or will that cause me to look like the person she made me out to be?