a snake in the family

 im married 2 my highschool sweetheart, been together 12 yrs married 5. havee been getn along weel in his family and gotn close to my mother in law. i loove her dearly. became friends with my brother in laws girlfriend who ive also known 12 yrs but never liked her because i saw as a very fake person. but when i became close with her about 2 yrs ago, i thought shed grown up and changed. well, i was very wrong. i had a great relationship with my sister in law, who my brother in laws now wife ashley was also friends with. but they had grown aprt ovr yeaers so when she found out my sister and law and i wer close she didnt like tht 2 much. they strtd talkn and i noticed my my sister in law backin off frm me over time. i questioned ashley and my sis in law as to wht was goin on but never got an answer. well come 2 fiind out, ashley was telling her lies about me to turn her against me. ashley is the biggest liar ive ever met, she lies about everything and ive now caught her in a few. i was cordial in the beginning of all of this but now i cant b.i cant b fake and act like all is well. i wana confront her but at the  same time dont wana look like a fool and cause drama. now everything she does pisses me off, we have family dinner every wknd. and ive noticed her copying my meals. and she acts as if she doesnt and calls it her own. im a houswife, so cooking is my thing, i take pride in it and it is my passion. how can some1 act like tht, just steal someones recipes and call them thr own and not even b embarassed tht everyone sees shes copying mine, and i know we all talk about people, no one is innocent of it, but shes lieing about me to turn people against me, and shes not done. she finds any little thing now to make me look bad and her look good. why does she feel she has to compete with me, and what should i do, wierd thng is im not nice to her but shes very very nice to me, smile in your face person...cause i kno she hates me. i hear it from every1 shes talked about me to. please someone tell me what to do..wer family, theres no escaping the matter, and we see eachother every freakin weekend1 help1!!!!!