To be fair, it would seem that there were far more people who thought she was utterly lovely than those who thought she was really odd and weird.
Personally, I don't think she fits the profile of a female serial killer; sure, she seemed to have no dating history, but she was clearly extremely social and seemed to have a wide circle of friends. She certainly wasn't the typical wall-flower type by any description.
A point I made at the very start of this (well, 2020, when she was actually charged) was that all of her photos that we had at the time were taken by other people who were clearly friends in social situations such as pubs and suchlike. And these were very likely photos which were snatched from her friends social media profiles such as Facebook. People don't generally post pictures of people they dislike.
Having said all that, female serial killers are extremely rare and there doesn't seem to be much similarity between them, tbh.
This is why I find her so fascinating; she had literally everything anyone her age could ever want. Every door was open to her, she was educated, articulate, had a good and financially stable family background, good work ethic, was in a secure job, and was decidedly easy on the eye. Odds are that her plan was to marry a doctor (I think she even wrote that in her diary at some point) and I'm sure she could have done that without too much trouble.