Essa is very patient, but almost to a fault. In many ways her patience is something helpful to her studies of the force; her focus is mainly on healing and the living force, both things that you can't exactly rush. Sure, you can connect with the force to encourage the cells to heal a bit quicker, but there is still a limit.
Her patience was a repeated point of frustration for her padawan, Ivlin Zillis. He didn't understand why she would wait for so long, just watching as assessing a situation before jumping in to act. He didn't understand why she would let him try something only to watch him fail, and fail, and fail before offering guidance. He eventually did come to learn that she wanted him to try things on his own, to use his creative problem solving skills and his knowledge of the force to help him through because she wouldn’t always be there to guide him.
Essa’s patience is simultaneously one of the things she values the most about herself, and the source of one of her biggest regrets. She had endless amounts of it to give to her padawan to try things himself, to the point where she waited to step in until it was too late.
Blaster bolts grazing too close, too quickly for comfort; a step too far onto unstable ground; the crumble of rock and the startled yelp as he fell, both of them shocked and slow to react; the sound of him hitting the ground, unable to focus the force enough to slow his fall. Essa had leapt down to him, knelt by his battered frame, and leaned into the force to do everything she could to keep him stable until help could arrive. She very nearly gave everything she had to save him; sometimes she wishes that she had, that it would’ve protected him from the fate that he and the Jedi had faced.
It was bittersweet; her padawan had passed his trial of flesh, but it had been her patience, her trust in him, that had put him into that position. She could wait, and wait, and wait, but it wouldn’t stop the will of the force.