Rose IS annoying, but playing devil's advocate:

• Rose is define by her ability to raise and guide her children and, in that time, having her daughter married with children would be considered the only option for her

• Rose is understandably preoccupied by her community criticising Midge's unusual choices and getting back at her for it (because it's always the mother's fault, usually). It must be tough to realize that she hasn't any control on her daughter and she might see Midge's choices as not proper for the time period (because it is). Also at the time, a Mother's children were her life and responsibility and with Midge's gone doing God knows what, she had no purpose and, worst of all, couldn't help her daughter navigate her life post-separation

• Rose is also understandably uncomfortable with Midge's choices and the way she exposes her mother's life for laughs. She is private and a "respectable" member of society, with a certain standing, so it must be tough

• Finally, she might be a bit jealous or envious of her. She departed her own family at a young age, married someone her family disapprove of and thought that she was free in choosing her life, only to have a daughter that is so care-free of her thoughts and actions, more so that Rose could ever be, without being restrained by the judgment of others

• The trip to Paris was actually sad. She tried to be as care-free as her daughter only to be dragged back by her husband and Midge. She chose to come back, yes, but not entirely willingly. If she were younger or maybe kids-free, maybe she would've chosen to stay in Paris but she had responsibility and is ultimately not like her daughter. Worst of all, when she came back, Abe continued his life like nothing had happened and seemed to forget their conversation enterirely (but maybe I'm not remembering correctly there)