My Sil says I'm a bad mom?

she thinks she's the best mom in the world and she's not. totally rude to me always and always making snide comments. shes just horrible. i chose to use formula. sleep is really important. everyone knows that and my pedi told me that i needed to get my baby into a routine early and the leaving her to cry was ok so i did. my baby is now 18 months and she almost always sleeps through the night. her baby is 7 months and sleeps with her even though everyone knows that heaps of babies die from being suffocated when you cosleep with them. she thinks shes better cuz she breastfeeds but her baby is always screaming to breastfeed and she cant even put her baby down for a minute. she thinks shes perfect because she uses a carrier instead of a stroller but her baby isn't even really crawling yet. duh wonder why? shes made nasty comments cuz i give my daughter fast food but she only gets once maybe twice a week. i don't think fries or chocolate milk are gonna hurt her! and she always says im too strict with my daughter cos i spank and yell at her so she knows not to touch things. i'm not raising a spoiled brat. her baby is only 7 months and sooo spoiled. my baby is smarter and healther than other kids her age! she can say heaps of words and she knows all the characters from sesame street. she hardly ever gets sick. just colds from daycare. shes always posting links on facebook to studies and stuff saying that breast milk is better than formula and crap even though my pedi and heaps of people have said that formula is the SAME as breastmilk. it has the same stuff. and even that spanking makes kids stupid which is just dumb! how can they even decide that? she acts like shes smart but shes just trying to be a fashion mom with attached parenting and crap? how can i tell her to mind her own business?