When does the shedding start

My girl is 9 months old tomorrow (should probably leave the puppy sub soon) and I wonder when dogs start shedding? She hasn’t lost a single hair yet and when I brush her, all I get are 4-5 woolly strands of hair.

Does it have anything to do with when girls get into their first heat? Because she hasn’t yet.

She’s half GR and half saluki, so I expect there to be quite some shedding.