https://apexlegends.gamepedia.com/Non-player_characters#Mystik
Here are where the NPCs of the game are listed and described.
This link takes you to Mystik
The lady in the drone sounds old. Mila sounds young. That's proof enough.
It has been confirmed that Mila was indeed murdered by the Syndicate after they found out that her and Crypto found a prediction algorithm for the Apex Games.
Some people speculate they kidnapped her to help them find Crypto, but in the cinematic, they try to kill him, and Mila disappeared before that. So, assuming they expected to kill Crypto, then there would be no need to keep her alive.
Crypto is also constantly mentioning he wants "justice" (for the murder of Mila) and the entire reason he is in the Game's is to get closer to his sister's killers and the people who Framed him.
Mystik is definitely in contact with Crypto, but she doesn't need to be a good technician/hacker to have access to his drone: Crypto could've just given her access and that's how they communicate.
