I personally don't in the beginning. I keep mine on me with minimal contact with anyone that won't be a part of their lives....for me, basically that has turned out to be NO contact with anyone other than my immediate family.
When they are on me... I'm the safe zone...I will touch and pet them...similar to what you describe when you let her stay in her pouch. Yes, she does need to get used to being handled but that can be accomplished while she feels safe.
They normally don't like being awakened during the day anyway, so if your sister did this, she probably wasn't too happy about it...then mix in the fact that she's still getting used to you both, her surroundings, and now some new person she has never even smelled before.... I'd say that's a recipe for a cranky baby.
Keep her on you, bond with her as much as possible...and I personally wouldn't let anyone that isn't going to be regularly handling her even touch her for about a month. Let her get her confidence with you first...and I think in a month when you hand her to a stranger (to her) she'll jump right back to you.... and that's what you want.
This is just my opinion and how I would handle it. Others may have different views that could suit your situation better.