her ileo is pretty new, less than a month right? if that's the case, the noise will settle down a lot! as long as she doesn't get hungry, or eat the gassy foods. and usually even though she can hear it, most people can't. if shes really worried, she can wear like an extra tanktop under her clothes, or maybe keep her coat or purse on her lap.
as for the smell, you can but these adapt lubricating packs, they are singles, and she can carry them with her, they take care of smell and she wont have to worry about a bottle, she can get it out, use it then toss the package, without having to put the germy bottle back in her bookbag or whatever, lol. i always put one or two in my pocket when i go out, so i can use them.
as for seeing it, noone will.
and it its new the smell will calm down some too, and she can figure out what foods make the smell the worst and avoid those while at school. like for me, ranch dressing, blue food coloring, ham, onions, broccoli, fish those make the most horrible smells in the world! not even m9 can control the fish, lol. but like they said, in a public bathroom noone knows who is making the smell anyway, and most people wont point it out, cause then it makes them look guitly, and no longer than it takes to empy, most people dont think youve been in there long enough to make that smell, lol.
i hope she has a good year!