It's probably the influence of having another bird around rather than the molt. She wants to stay on top of the dove's cage so it sound like maybe she wants to flock with him. She flies with the dove because it's instinctive for the whole flock to take off flying when one bird does it. I don't have a directly dove-related explanation for why she wants to stay on your shoulder, but it's possible that she's still adjusting to the changes in the household and wants to stay with you because she feels safe there.

Well if the dove is in my hand, and not in the cage, then the whole "wanting to flock" explanation doesn't make too much sense, as to why she acted the way she did. I think that she just didn't want to step down from a comfortably high place, and is starting to feel a little more angry about doing things she doesn't want to. She's always liked sitting on my shoulder, but she's never objected to having to come off, before.

Heck, yesterday, she hissed at me as I was filling up her food bowl.

You know her better than I do at this point lol. Birds are ingrates and sometimes they literally bite the hand that feeds them. But this is usually related to breeding hormones, I haven't observed "molt crankiness" to be a major factor.