I'm going to hang on to the thought poor Savannah was drugged quickly and did not know or feel what was about to happen.
Yes, I was thinking they may have subdued & drugged her (or vice versa) upon her entry into the apartment.
Also, I don't believe the 3x consent to searches inside that apartment employed the use of K9's, though K9s were initially used in other search areas.
I believe Savanna was inside that very apartment & I can't come up with any other explanation for the 15 mins of a constant banging sound in the bathroom (followed by shower water) heard by the neighbor below at the approximate time Savanna would have entered their apt.
I do believe she was somehow removed (still pregnant) quickly after the bathroom banging incident.