Maybe I should'nt make sucha a broad statement. BUT, I have seen too many times where the DIL is the one causing all the problems. Much moreso then the MIL.
Being a DIL you should expect the MIL to dote over her son. This is typical. Most daughters are close to her family even after she takes a husband. Sons, I believe want to be close after marrying but have a nagging voice in their ear all the time. Most DIL do not want to see the MIL and son express any emotions towards each other (again this is what I witness in my family and others around me). If the son hugs his mother or recieves gifts he is called a mommas boy, etc. But if the DIL does this with her parents it is suppose to be totally ok. My mother bends over backwards for my SIL and brother. Keeps my nephew overnnight alot, goes and gets him from school, buys him clothes, etc. But my SIL always has something to complain about. She is so controlling and thinks her way is the best way. Which we and most everyone around her thinks she is a nut and is lacking common sense.
My mom nods her head and does what she wants, after all DN is taken care of (better then with her) and he loves her. She may get mad at how some things are done but we are at the point where it doesn't matter anymore. I could write books and books on this girl and her controlling bi-polar personality but i won't. I said all that to say "MOST" DIL expect WAY too much from their MIL. People are different and are not going to do the things you want them to (well, except my mom) do all the time. I would just consider her feelings and step back and look at myself to see if I am doing everything right. I tell my SIL ALL the time that she will have a DIL one day and it will most likely come back to bite her. Or I hope it does. I wish that my DN will marry someone just like his momma