And, remember that the canopy can limit her vision (especially behind and to the sides) but even forward, if, for example, she is parked close to a building, she might not be able to see "up" the side of the building due to the canopy.
Not to mention that the canopies are bulky, don't do a good job of keeping out the rain (that's why so many ponchos are sold at WDW) and are generally considered a nuisance by the large majority of folks. They block the view of people who have to stand behind them, they cause problems when boarding/disembarking on buses and boats (due to visual limitations) and they make the
ECV feel HUGE in terms of the physical space it takes up.
There are umbrellas that can be moved to help with the sun/wind, and be taken down easily (at night and on the bus, etc.) that can be purchased from
Amazon.
This is the style I have, however, although it works really well, I rarely use it at WDW, simply because it is more trouble than it is worth.