everyone is sitting there seething at you, even if they don't say anything (it's Britain after all, the home of the passive aggressive silence). If she won't wear headphones, put your device on mute
Let them seethe! They also seethe when she's shrieking and bouncing on the seat. A typical bus journey without the tablet goes like this:
Me 'lets look out of the window, what can you see?'
DD 'car! CAR mummy, big CAR! Ooh bus, look BUS! BUS!!' (Voice rising to deafening shriek so people cover their ears).
Me: 'ssh too loud'
DD: 'oh look mummy wheeeeee, WHEEEE' (stands on seat)
Me 'sit down let's look at your book'
DD 'I bouncing! Mummy look! Ooh hat! Red hat! HAAAT! Want hat!'
Me 'don't touch the lady's hat. Let's look at this book. Look it's a...'
DD 'cat! CAT! Bad cat, ooo noooo' (throws book into aisle) 'ooo NOOO'
(Has tantrum when restrained, everyone is glaring now!)
The tablet on mute doesn't work. I've tried. As soon as she's old enough not to rip them off we'll use headphones.
I'm afraid quiet electronic noise has become everyday life on public transport. I don't see it's much different to other irritating noise like talking, coughing, sniffing, tinny music escaping from earphones, people tapping feet or rustling bags.