Don't get frustrated with Miss Balch, no one can say how they would act in her position until they've been in it. Yes, the other girl seems to be getting on with life better but everyone is different and deals with things in a different way. If she was prone to depressive moods anyway, I've read nothing saying she is but it's always possible, it could be incredibly hard to deal with and focusing that sadness onto the object that caused it is totally understandable.
That said, I hate when people talk about respect in situations like this. It's a poorly defined word in this context. We could open the ride now, it's fully functional, buuuut we're gonna keep it closed for an arbitrary length of time since... you know, Respect? Also we're gonna paint it all black and call it the super sombre ride and anyone who shows enjoyment on it will be politely shunned and told they are a bad person. Ok i'll shut up.