Rosalind loved her mother in any time period but she had to admit that dealing with another twelve-year-old's moods could be unpredictable. There was a reason she never got along with people her age before now.
She was used to Izzy being the adult not a peer. That changed things.
Since she was all Rosalind had left, she had to deal with it as best she could. Which meant involving herself in things she could not care less about. Such as the ongoing saga with M&M Guy.
She didn't care about her mother's childhood crushes. No matter what Izzy said about thinking he would be weird if she talked to him, she did it anyway. And answered his rather blunt summons the day after. She definitely had a crush.
This wasn't too worrisome because it was so far before her parents were supposed to be married but she didn't want to be involved. It was absolutely vital they got together so she and her siblings could be born and be reunited that way if nothing else.