Oh no hun don't feel bad, it can happen to anyone. Can you call something like Nurse On Call (not sure if you have that in NSW) for some advice?? I would think if the colour is getting better and not worse (blistering) she should be fine.

ETA: Just found this number. I call NOC all the time just for reassurance. THey should assess over the phone and tell you if you need to do anything else. 1800 022 222