Protagonist of this story goes and jumps to episodes to episodes (or in this case for her, Timeline to timeline) to either stops an incoming event or cause a lot more chaos.
Usually, the mane(see what i did there?) character will get upset if the event was too late to stop, but for Rosa Light(that's her name btw) case, she doesn't care, she WILL be part of the event, if the ponies or gods like it or not.
For others, any catastrophe events is the worst thing ever, but for Rosa, its just another tuesday.
Rosa is an earth pony with abilities that can either make pinkie pie jealous or impressed.
She can use chaos magic anytime but prefers to just use her 'smartness' and tools.(She stills uses chaos sometimes tho)
But enough random facts and unnecessary descriptions, i don't wanna spoil too much.
So enjoy the adventure of the time travelling comedian as she portake such 'challenges' and totally serious fights and also chaos.