mabrook her mil does give her a hard time so i would think she isnt happy in her own life hence which is why she cant see anyone else happy
i find it hard to think if her mil is giving her hard time shes taking revenge from u.makes no sense.elder sis r not like that.
u urself said she said she'll make sure u n him get together n u become a part of her family , both to u n to ur mom.that was in the earlier stage of her marriage.as she came to know the family better she got against the idea.but u shunned all her advice n followed ur heart blindly.that made her angry at u.
i feel superiority complex in ur tone.i'm this n that n better than my sis in this way or other.don't forget u got the chance to meet ur man coz of her n her wedding into that family.she didn't giv u congratz on a good job coz u already r bitter with each other these days and perhaps she sensed same pride n sense of being better than her n "u r just jealous of me" attitude n is therefore ignoring u purposely.
forget ur ego n u better talk to her with open heart n mind rather than putting all the blame on her.