If you bring Mon Mothma in a 4 man team to this gal challenge and summon her rebel trooper, you won't get the payout for the small squad feat.
If you bring her in a 4 man team and don't summon the unit, then the feat will trigger and give you the payout.
If you bring her in a 3 man team and summon the unit, then you will also get the payout.
So, the summoned rebel trooper is counting as a real unit in gal challenge. I don't know if he's counting as a real unit in other places too, but it wouldn't surprise me.
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