Interesting, I didn't know there were so many meanings for the word . I did know that perambulator is the proper word, with pram being the slang, for what we on this side of the pond call a baby carriage, and as such was my first thought. It has already been mentioned by others. Your daughter will have to consider context and make her best educated guess. My thoughts now lean more toward the wide walkway mentioned by expendable, considering what context you included.
soaring
You're most welcome my friend.
You got me thinking now though about the plimsole line. . . you know how you think you know something then, when you re-e-eally think about it you're not sure how or why you know?! I think - now that's only think mind you - that it is a line you can actually see on the outside of a ship where the water level comes to. If it goes below the water, then the ship is overloaded so, what you said about load line sounds about the same then doesn't it? What I know about ships you could right on my little finger nail :-)
Well, you all got me curious about ther term plimsole line so I wiki'd it and this is what I came up with:
http://en.wikipedia.org/wiki/Plimsoll_line#Load_line
I found it interesting enough to share.
soaring