Let me start with a brief background. My BIL just got married 3months ago & my new SIL is a decent human and we share a very cordial relationship with minimum communication. Now, I don't have a great relations with my MIL, she has the least empathy in herself towards any human ever and her narcissistic personality ticks me off. My FIL passed away when my husband was still in collage so my husband almost played a father figure at home and we were deeply involved in BIL's match-making (arranged) & wedding rituals. I have a good bond with BIL and genuinely feel for him & so for my SIL. Everything was perfect and rosy the first month of wedding, we stayed together for 2weeks after their wedding & returned to US. SIL started showing signs of stress & she had totally become this person I dint recognize, the newly wed excitement & her happy-go personality had vanished. I knew something was wrong but just dint want to be involved in anything since our marriage went through some rough time because of MIL. I just dint want anything to do with her. But SIL would reach out causally to tell me she's still trying to adjust and she is finding things very difficult. All i did was motivate her & told her it was normal to feel all this in a new environment. But i never gave away any specifics to her about my relationship with MIL or issues i faced. But since MIL & myself make no effort of talking to each other, SIL already knows something is not right. She once asked me directly and i told her very subtly that mornings are normally busier for me with chores & a toddler running around all the time, hence its hard to make time for the "video call". Also told her somethings are better left unsaid. She was nice, she understood & never forced me to express a anything in particular. Out of the blue, 2 days ago SIL's mom messaged me. She normally makes constant contact but i was trying to keep it low & replied once in a while. But this time her message was more serious. She mentioned how upset she was that my MIL wasn't treating SIL (her daughter) properly & how for weeks together MIL wont speak to SIL, making faces, restricting making contact with maternal family, controlling BIL too (probably fighting him as well). Once SIL burnt her thighs trying to make something in the kitchen & MIL dint care. Span of 3months she fell sick at least 3 times (due to various reasons) & every time MIL would not show any concern. Now after reading all this, i made a call & spoke to SIL's mother , mentioned it was not right for me to comment about MIL but only advised she should confront my MIL directly and sort it. She said they already tried all that but MIL would just not acknowledge the problem & be open for a discussion. SIL's mother mentioned she will talk to my husband (since he's the father figure) and see if he can help. We also concluded the call saying we would not discuss this with anyone. But she wanted to know if i could help SIL, provide her tips on how to be & what to do so she could handle the situation. After this call, i have been very disturbed for a few reasons- - Part of me is very guilty for not helping SIL. She reminds me of my younger self. I can totally understand what she is going through & knowing my MIL, i know what exactly is going on there right now. - I casually mentioned to my husband that SIL's mother was asking about him & he said he will call sometime in the weekend. (this was before i got those lengthy messages from her explaining things). Now i am guilty of hiding it from him. - Once he gets involved, things are going to get nasty, i know my MIL, she plays the victim card very well, she always has. DH is already very stressed due to his job and other things plus we have our own unresolved issues. I casually try to fill up SIL with some motivation & gyan without getting specific about anything. Not sure if that's helping her because she's gone very silent and it scares me. I understand this is her battle and she needs to fight this but i cant help but think & reflect back on the time i felt as miserable as she feels & how lonely it gets. I also know my involvement would stir things in a wrong direction & even otherwise MIL is waiting to declare that i am influencing SIL in some way (MIL dint seem to like our little bonding time we had before we returned to US). Help! Any input is appreciated. Thanks for hearing me out!