I think the issue with Jenna’s character was with the three different actresses we get three different Jenna’s
MF!Jenna of 1978 is completely different from FT!Jenna of 1980 who is completely removed from PP!Jenna of 1983-88.
At first viewing this is acceptable as the appearances of all the 3 Jenna’s were years apart from each other but on rewatches it becomes a problem
MF!Jenna was a bitchy mistress type, whom you could believe Bobby would have fallen for in his youth, but had they married their marriage would have collapsed, this Jenna was a con artist type, very much in the vein of Kristen Shepherd
FT!Jenna was too dowdy in my opinion, and not a believable threat to Pam and Bobby.
Ironically upon rewatches I think PP!Jenna is perhaps the best, she struck a balance between the rich girl who’d fallen on hard times very well, PP could be glamorous and mumsy, this Jenna was a threat to the Pam/Bobby love story, I could see this Jenna having an affair with a married man like MF!Jenna too.
While Priscilla Presley’s acting isn’t always good and she’s nowhere near VP or LG in the acting chops, she’s good at Jenna.
The main problem I find with Jenna also is that the writers struggle to find a way to keep her in the show when she had long passed her sell by date, then they stick her with Ray whom she had zero chemistry with