Open dispute is later than delivery time

[adoreonline]

I’m a seller. A client ordered a gig which needs gig extra. Based on my experience, clients get frustrated when they receive a ‘dispute’. So I tried to be nice and sent her a message with the gig extra. But she’s not responding to any of my messages, so today I opened dispute (and I’m left with 24hours). What happens if the time is up and I don’t deliver? Will it reflect on my profile? I can’t be delivering a placeholder/something that’s not right but at the same time I hope my delivery efficiency percentage won’t drop.

Advice pls?