When a mother sees their child for the first time and feels overwhelming love for them. Or when an older sibling sees their newborn younger sibling and feels a strong doting love for them. Both scenarios could be considered love at first sight.
No one ever said love at first sight had to only be romantic. Implied? Sure. Only romantic? Nah.
...I do love a good yuri, though. I just hope the age gap isn't that big. Elodie could be, like, 10 and Sera 14 for all we know so it could potentially work out. But even if it doesn't work out that's fine. Just seeing them care for each other and be cute is pleasant as is. ^-^