Hi again!
Hope things have settled down a little for you all.
We get our pump belts/bands for funky pumpers or pimp my pump.
I would suggest starting with a lycra one first because of her age.
My lo has 4 bags/belts. She gets to pick which one in the morning she wants to wear, it adds a bit of fun/choice.
It's really a case of personal preference to be honest and what's comfortable for her.
My lo wears a lycra one at night and a belt in the day. There's loads to choose from, ones with 'button holes' at the back are really handy as you can tuck away all the tubing in the pump bag/belt.
Hope this helps.