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For delays you do have to travel to claim EC261, if you are in scope for it. There are only a few exceptions to that, and that's where delays and cancellations are treated differently. There are about half a dozen unallocated seats in ET so I wouldn't be worried, and if there is a childcare issue then the gate should IDB someone else instead, but would probably work around you volunteering not to travel. But I don't see a problem at the moment, she will have a seat allocated via Theoretical Seating, she just won't know what it is until she gets to the gate.