Unfortunately, it's even a little worse than that. Per MSM reports, KB's parents were the ones who found what they suspected to be blood visible in different locations at her townhome.
KB's parents then alerted LE to their concerns r/t suspected blood having been found....this after LE had already done a check of KB's place and found nothing amiss.
So, it wouldn't even have required Luminol to see that there was some potential blood evidence that was concerning. At least, it didn't take Luminol for KB's parents to see evidence of foul play, i.e, suspected blood, and to sound the alarm.
This really was an unfortunate oversight on LE's part. Any time a responsible, stable parent to an infant child goes missing leaving their infant behind, LE should treat that disappearance as suspicious and proceed w/ their investigation accordingly.
All of the Above: JMO.