It is hard to be the mother in law to some daughter in laws. I think that if your mother in law is wanting you to make the effort it is because she isn't comfortable just showing up and if you are like one of my daughter in laws, you make it clear you rather be doing something else with anyone else. I thought at first that we could have a close relationship like I do my other daughter in law. I took her shopping for wedding stuff, buying all the bridemaid dresses, flower girl dresses and the toast glasses and such that her parents didn't have time to shop for with their busy schedules at work. I didn't mind doing this, I loved it. After the wedding she and I spent a lot of time together while I taught her how to do machine embroidery and we had a great time with it. Then after she got her own machine it seemed that she didn't need the friendship anymore, I would offer to help her when she didn't have a car to go to the doctors appointments while pregnant and she would cancel the appointment rather then take me up on it. When my youngest son died she posted it on Facebook and that is how my sister in law and neice found out he was killed in an accident. When they came over that day she insulted not only me, the widow but also two cousins who were very close to my son. Then when they came over for my 50th birthday she posted on her facebook that she was here and if you could save me, now is the time. Then I became the "bi*ch" as she calls me on her FB. I don't have much to do with her, I go through my son to see the kids. They did go to my parents for my dad's bd party and that is the first time she didn't have some excuse that they couldn't make it in the year and half they have been married. I had printed off my son's journal for him. I kept journals on all three of my kids. I felt bad that my youngest son never had a chance to really read his and knowing that my oldest son loved reading his while he was little, so much so that he had me read it to his class in 3rd grade, I figured he would enjoy it. She claimed it would get ruined at their house, that they didn't have any place they could put it, so he left it at my mom's for her. Yes I do complain that I don't get to see my grandson and granddaughter (my son adopted her daughter from a previous relationship) often enough and no I don't go over to their house because to do so wouldn't be met very well unless my son is there. I also don't drive in the winter, especially now that I lost my son in an accident, the panic attacks are really bad. But I don't put my problems on facebook and I don't act ungracious to her when we are around each other. I love my children and grandchildren with all my heart and would do about anything I could for anyone of them but when I do go over there and it seems like a inconvience to her then what are you suppose to do? If I call before hand, she is too busy, it isn't a good time... always... that is if she even picks up the phone when she knows I am calling.
So make the effort or let her know it is ok to drop in on you if it is. Set up a certain day for her so there isn't any effort on either part, it is just their time together. Most of all make sure you have a friendship with her and then there is no effort. My yongest's son's widow and I are very close and I know I am never intruding when I see my granddaughter. She brings her over here every weekend and we either meet half way or she comes here to pick her up after church on Sunday. We shop together, we go to plays together and we have a mother/daughter relationship that is strong. That is what I want with my oldest son's wife but she isn't willing... and that makes me closer to my youngest son's daughter then my other two because I know her better having the time to bond with her.