Pick her up if you're comfortable with that (my son just got too heavy). She is, in some ways, still a baby and I think cuddling, holding, ultimately help her become more secure and independent. It would be one thing if you were doing things for her like feeding, etc that she's capable of so I wouldn't fret too much.
I think you need to address the yelling though. That's a "baby" thing imo that she needs guidance in how to outgrow. I would consistently make sure she understands that you will not be addressed like that. She should not get what she wants by behaving badly. That only reinforces the bad behavior.
It sounds like she's trying to make the transition from being the baby to being an older sister. She's adjusting no doubt. Good luck!