Dr. Wakeman built the XJ series after the Armagedroid debacle, and then you realize that she did so to build a humanistic protector, one who wouldn't be greeted with abject fear everywhere she went. Which is why Jenny is the final model, and the slightly-less-than-human XJ8 is the younger sister.
Another Escape from Cluster Prime example: Vega describes her mother as a, out of all the words in the world, tyrant. Considering that Vexus took away her kingdom's rights to defend themselves, and framed a foreign robot just because she didn't want to become a resident of her home planet, leaving her home planet open for any hostile takeover...
In "Saved by the Shell" after a disastrous date with Don Prima, partially caused by the Silver Shell, Jenny decides that she doesn't like either of them. Jenny never fawns over Don again in the series, but whenever the Silver Shell returns she goes back to admiring him. It could be rubbed off as a continuity error, but it's shown time again that Jenny feels very lonely since she's the only fully sentient robot in the town. In "Love 'em or Leash 'em" she immediately tries to date Kenny simply because he's a robot. Jenny is likely tolerating the Silver Shell's rudeness because she still longs for a robot partner.
One episode features a villain called Armegeddroid. He was programmed to destroy all weapons, but goes a bit too far with his mission. When he comes back, Jenny realizes "He must destroy all weapons. He has no choice!" She then proceeds to show him that he is a weapon, so he must be destroyed. So he self-destructs. What. The. Fuck, Jenny? Even better, in an older, unrelated episode, she tried to convince what she thought was a Cluster drone that Wakeman could reprogram her so she wouldn't have to be a member of the Cluster, but Jenny offered no such thing to Armegeddroid. The kicker? Since Wakeman created Armegeddroid, he is technically Jenny's brother. She talked her own brother into committing suicide.
To be fair, he tried to destroy her first.
Plus, I don't think Armageddroid would be one to cooperate. We can also assume that Wakeman already tried talking him down in the past, holding "trick him into diving into a volcano" as a backup plan.
There's also Wakeman's decision to keep XJ's 1-8 shutdown. So basically, she was keeping Jenny's sisters down in her basement never to see light again.
She loosens up on this later though, and in light of events during the series it's safe to assume that she did so for the sake of public safety. Maybe a lack of a proper anti-virus or firewall? XJ-8 alone would be problematic to deal with if the Cluster pulled a Brainwashed and Crazy with her somehow.
Whatever happend to guy the Exoskin took over at the of "The Return of Raggedy Android"?
It's Mr. Mezmer, and he's seen in other episodes perfectly fine, so he got it off somehow. Still, the suit is still out there.
Jenny, being a robot, will most likely outlive all her friends.
Somewhat mitigated by the fact that Nora has a de-aging machine, so her friends could use that if they get too old.
In the Christmas special, everyone who wasn't Sheldon believed that Jenny had snapped and started destroying holidays out of her own volition. This includes Brad, her best friend, Tuck, who considers her a Cool Big Sis, and her own mother. That's horrifying on two levels. The first is that this episode kinda establishes Sheldon as a Love Martyr (though downplayed since Jenny does give him a mistletoe kiss in gratitude). The second is that even people who know Jenny personally were easily duped into believing that she had turned into a raging monster, didn't bother to investigate to see if there was any evidence that it wasn't her choice to do what she was doing and were prepared to shut her down permanently.