This is the 498th most frequent Turkish word.
hala
1. Aunt (paternal) 2. Still (yet)
In this sentence, 'hala' means 'still', indicating that the action is ongoing without interruption.
Hala bekliyoruz.
We are still waiting.
Here, 'hala' is used to inquire whether the action (coming) continues to happen.
Hala evimize gelir misin?
Do you still come to our house?
In this context, 'hala' emphasizes the continuation of the state of not having a sister.