I’m so sorry that you are having a miserable time, but one thing I have learned from much reading about family and in-law relationships, is that sometimes dislike from a relative, in-law or anyone, is quite random and is just how the other person operates. I think you’ll find that your DiL has an ‘issue’ with many other people too. And disliking you for being too ‘happy’ - oh, come on, what is she thinking?
My lovely step-daughter, for example, has married into a family where her MiL, who has four adult children, has taken a huge dislike to someone in each one of their marriages. She hates all 3 of the sons-in-law and in a horrible twist of fate, she really dislikes and ignores me, ie the ‘other granny’. She’s far too sensible to hate my step-daughter, ie her daughter-in-law, so I’m sadly the one she has chosen to dislike. It’s her modus operandi!
Have lost count of the sleepless nights and upsets that I’ve had over this, unfortunately she is also very manipulative with our grandchildren. Like others on this thread, I wish I could go back 20 years and just ignore her.
PS Your idea of a ‘welcome baby party’ seems absolutely lovely, you were welcoming both mother and baby into your family, and I think that many DiL’s would have loved it.
Onwards!
🌷🌷🌷