Carissa knows the trick for spellcasting without material components; she picked it up at the age of sixteen when a fellow student stole and tampered with her spell component pouch on the day of an important exam in an attempt to get her beaten nearly to death. (The attempt worked. She figured it out the next day.)
But it's not really recommended to spellcast without material components if the material components are also a way of selecting an input to the spell, like, say, its target or its destination. It is in fact supposedly impossible, to scry someone you've never met without a possession of theirs or to Plane Shift without a tuning fork.
However, people are cowards, and say that all kinds of things are 'impossible' that are actually just a little tricky, and she's not sure if this is one of them, so she's been toying around with it in her spell development process. (She did, first, make a tuning fork for the plane she is currently on, so that if her mad magical experiments succeed she can go back.)
Can you Plane Shift without a tuning fork? To her great satisfaction, the answer turns out to be 'apparently yes'.