Administrator Issues (?) in IE8

I am not seeing this issue directly, but my client is. See our discussion below:

Can you view calendar events on the website (as a normal visitor) when you click on events in the sidebar?
YES

Can you view calendar events on the website (as a normal visitor) when you click on events on the calendar page?
YES – The box appears and gives you all the information on the event.

Can you add events to the calendar (as an administrator)?
NO – The top bar of the box to add an event appears but not the rest of the box where you actually put the information. So the only thing you can do is X out of the box.

I am not very knowledgeable when it comes to ajax. Are there any specific settings that would prevent her from being able to add to the calendar like that?

Thanks so much!