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I second what steelerbear mentioned about talking to window and security vendors, and I'd also include architects and insurance companies as they may have a suggestion that is appropriate and will give a discount on insurance. If these are double paned windows or have other features that save on heating and cooling there's perhaps another rebate and long term money saving. Just looking at the house you can't just focus on the first floor since the windows on the second floor could be accessed by a determined creeper.
The women may have to accept that to get rid of the bars they would have to have windows that don't open or only open with a small vent. Since you mentioned that they are already making choices that are unsafe (going out on the roof, blocking safety latches, leaving windows open) it may just be easier to change the windows to prevent that behavior at all since it is a problem and likely to still be one with 18-22 year olds. You mentioned there is AC, so at least the windows aren't used for cooling.
Since your windows look like sliding ones you may have to get new windows to provide security. In the mean time you could get thick wooden dowels painted glow in the dark, to a length that prevents the window from sliding more than the approved amount. The girls could remove them but at least in a fire they could see the dowel to remove it and/or use it to smash or get attention from rescuers. Switching to tilt and turn/slide, or a top opening sash is an option as in an emergency they can be easily opened from the inside for safety but keeps people out.
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