As a spirit, Ilyin was supposed to borrow Alena's mana.
Throughout the months, she constantly used her own energy to riot against Alena. Thus, her mana ended up being depleted and she lost her only means to fight her captivity.
Because she didn't enter a cooperation with Alena and couldn't settle down into an agreement, to this day, the spirit could only fall into eternal slumber, only to be awakened by Alena to save the day just now.
Even while knowing the fact that Ilyin was heavily weakened, Alena was aware of something. A fact that she grew to fear whenever she thought about it.
Alena and Ilyin's status was not of a puppeteer and her puppet.
Ilyin lived inside Alena.
Although she could be called out as a puppet, Ilyin wasn't dead yet. Her will still existed.
This was because when she made the spirit into a puppet, Ilyin was not fully dead.