The Libby Squire disappearance may have been an opportunistic one off. But if so then I am not sure what we can do, other than make thousands of conjectures regarding the limited data.
However, give the possibility that this was performed by an serial offender, then the hive mind which is the websleuth's community may be able to spot patterns or similarities between cases which the police might miss.
Thank you for Renata Antczak
Missing Renata: 18 months on and still no trace - here's all we know
There is also mention of a "pseudo sports" car in the above article with police asking people for sightings of RA's Mercedes C220
Mercedes-Benz C-Class C220d 2018 review | Autocar
Unfortunately there are few details in the Renata Antczak case.
Another missing person with a possible car racer aspect is the Susanna J. Lamplugh case in which the victim was driven a mile in a Fiesta before being transferred to perhaps a BMW.