I still have a suspicion he was dangling her at or out the window and dropped her then made up this *expletive deleted*it about “oh she wanted to bang on the glass like a hockey game”. Plus leaning against glass is stupid anyway, who knows if it’s going to pop out at any time.
And it doesn’t look like a children’s area to me. Looks like a normal deck area.
The photo that has circulated of her banging on the glass at a hockey game seemed to show her standing on the floor, IIRC. There's glass right to the floor in that area of the ship. She could have stood on the deck, in front of a FIXED (non-opening) window and banged on the glass to her heart's content. Instead, the grandfather supposedly picked her up and stood her on a "rail" (which was apparently the window framing material separating the upper tier of glass from the lower tier), and somehow magically just happened to pick the one window that was open out of an entire row.
BS. How can you stand in front of an open window and NOT know that it's open? Either the grandfather was dangling her out of the window a la Michael Jackson, and dropped her -- or the grandfather stood her on the window rail knowing the window was open and he lost his grip on her.
Either way -- not the cruise line's fault. The grandfather screwed the pooch.