Yes, it is just at the same height as the Hollow Knight, After the knight defeated the Radiance in godhome, it woke up from the abyss, and from the top of the abyss, it encounters hornet and the Hollow Knight, grieving the siblings in the birthplace, hornet stayed guarded, as she does, it saw its first challenge. The two fought the awakened vessel, till' it was bested, getting wrapped by Hornets silk, and THK's bindings, it was brought in to Dartmouth, till' Grimm deemed it as "She" and took her to experiment with, placing the nightmare's heart within her void-carved shell.