How small is your daughter? If she is relatively agile and over about 5'2", I don't think it would be particularly problematic because the foot rest is actually positioned quite low.

I'm a bit taller than that but manage to get out of the window seat over someone's lower legs on the foot rest in a fairly tight skirt without compromising my modesty or disturbing the passenger in any way. This cannot be said about J seats on quite a few airlines, so CW window seats are in fact relatively easy to get out of. I have been effective 'stuck' in the window seat of various airlines so as not to disturb a sleeping passenger next to me by trying to get out, but I have had no such concerns at all in a standard CW window seat.

If you know how restrictive a relatively tight skirt can be in terms of leg movement, I think you'll understand what I'm saying (not that I am advocating trying it for yourself!).

Having said that, I kept my footrest down on my last flight in CW because the passenger in the window seat who had to use my footrest area to get out seemed rather frail and a little unstable on his feet and I did not want to cause him undue distress by forcing him to step over or to cause embarrassment to him by putting him in a situation where he had to wake me to ask me to put my footrest down. I would not have done this if I felt that the person in the window seat was agile enough to get out relatively easily, which would be the case for most people. I can't remember seeing many people having problems with it, including short ladies.