TAs seem to still have spots. (Though when I check vs when you do might be different)
Over on FB there's a page called "rundisney run marketplace". Join it and look for the TA posts.
Rundisney events, especially princess, are things that you book and then create your schedule around. If she wants to do it in 2018 she needs to find a TA or charity that has a spot, book it, and create the work schedule to allow her to do it.