She will be fine. There is so much going on that there is no way for her not to be safe. That being said, I would be nervous too. I hope you got her a mint to print money while she is there. 

Stop by City Hall and get your buttons. 1st time visitors can get some perks from time to time.  Bring baby wipes, even if you don't have little ones. Single ply sandpaper is all that is available. Comfortable shoes are very important as well. Pay attention to weather and pack disposable ponchos. Do not get in a hurry or plan on going anywhere fast. It is a slow, jumbled up mess of a place, nothing is efficient.

I have learned, from this vacation, what I really like to do on vacation. I like to go into chill mode and have no plans or destination. This place is not that. Everything has a timeline to get to or wait for. Stand in line to get on a bus, to stand in line to get searched to stand in line to go in the park, to stand in line to go around people that are getting pictures taken. Then you get to stand in line to go on a ride. Everything they do is very inefficient. It is an Industrial/Organizational nightmare. Having a military background, I struggled to understand what was going on. Very few people are on the same page. I first thought it was controlled chaos and figured out later that it was just chaos.

Research everything you want to ride and figure it out using your fast passes. Research where you want to eat and plan it out. If you don't, go into chill mode or you will meltdown. I was pretty chill the whole time, but had a few chances to lose it. I only snapped on one lady for trying to steal my seat while I had two hungry kids and a plate of food. I know people love this place and people hate it. You just have to realize what type of vacationer you are and plan accordingly. I will not be back unless it is required by law for community service.