First of all, ((hugs)) and you are not alone.
DD is such a happy,easy going baby and yet around mil the last couple of times she has cried, was super cranky and only wanted to be in my arms. It sucks because I find myself saying how sweet and happy she is and yet mil always sees her being a cranky, crying mess lately and I have to hear from DH's family, "Are you sure she doesn't have colic?" Grrr
Thankfully, yesterday when my in laws were over, DD was her normal happy self and was talking/squealing most of the time. My mil was surprised and I was like, but this is actually how she is most of the time.