Breastfeeding and My Sister

I don't know why or how or what on earth why my sister is so distrubed with me for breastfeeding my 30month old (and counting) little girl. She keeps on telling people that it's way beyond normal and for me to get a life! You see, I'm a work at home mom and she keeps on telling me my life is so boring. As if her life is so perfect there in Australia. She doesn't even have a husband yet and her teenager daughter only talks to her when she needs something from her. I am loving every minute of my life now. I just hope and pray for her to find real happiness in her heart.