Re: Dont even know what to call this....
- Even though this girl isn't making any comments at all on your FB wall..........go ahead.........and write positive comments on her wall (when you truly feel that way). In other words, leave sincere/genuine compliments on her wall.
^That way.......in case the girl has any insecurities about YOU.......or feels threatened by you.....she might think "Well, maybe I'm wrong. Saima left a compliment on my wall, she seems nice.). ALSO.........it shows your SILs (and in-laws in general) that you're a friendly person and have no issues with welcoming the new bride.
Continue being nice/friendly with your in-laws. Help them out when you can.....call them up to see how they're doing. I'm not saying that you should suck up to them and turn this whole thing into a competition between two women. Just be your nice self.
The messages this girl leaves on your SILs' FB walls.....are just words. They are not enough to determine her character or what kind of a wife/bahu/SIL she's gonna be. If her actions....especially when she comes over........are not friendly, then the words won't mean much. Actions speak louder than words. That said.....continue showing your respect for in-laws in not only words...but back them up with positive actions....so as to further strengthen your relationship with them.
It could be that this girl is really nice and does not have ill intentions. But in the event that she's not nice when comes over........continue being respectful, the bigger person. Eventually with time........people will see the difference between two people....they will come to see that one person is better than/more sincere than the other. Again....she might not have any ill-intentions toward you. Just try not to get worked up over this. She's not here yet.
Also, I would advise that I think it's better not to tell anyone from your in-laws that you doubt this girl's intentions.......or that you find something odd about her..........maybe not even with your husband. Because you don't want your husband or anyone from your in-laws to say or make the accusation that you never liked the girl from the beginning or that you had issues with her before she even came here....especially when they hold her in high regard since she's the daughter of a close family friend. Just be careful about that.