My MiL becoming cold...

Ever since I'm becoming pregnant unexpectedly in my late 30s, my MiL is being cold towards me. I have a stepson (her only grandson-my husband's son from his previous marriage) who he closes to me. I can sense that she is being jealous of me. I treat him as my own son not as a stepson. But well, I treat it as a challenge during pregnancy. Still thinking of sending my unborn son/daughter to infant care once he/she borns. As I know my MiL's health condition is not so well. Right now, I am in my 18 weeks. Still working. Every month, I still giving her money. As a respect. I'm staying with my inLaws as the house belongs to my husband. I did some house chores (even I am feeling unwell due to the pregnancy) but not for cooking as my MiL does it. The kitchen belongs to her. Just need some place to expressing my feelings.