So talking and rote and pseudoscience - can't see why she'd have to be particularly clever to have a degree in those subjects.
She's hardly the ditzy innocent airhead that she portrays herself to be. By claiming it was someone else's idea to change the words from 'bug' and 'defect' and that she knew absolutely nothing at all because nobody told her nuffink, she is masking her true status as someone who gets others to do their bullying for them whilst giving the appearance of being some toothy Pollyanna figure in a dog collar. At the inquiry she was ready to burst into tears because of that horrid KC asking questions, whilst at the same time she had a heart of stone when a 'subbie' topped himself in front of a bus.
Learning languages takes a certain grasp of logic, listening skills and a reasonable vocabulary. It is not 'rote learning' at degree level. You have to be able to comprehend complex literature in its original language. I mean, the other words for 'bugs' and 'defects' she got her husband to suggest to her: 'exceptions' and 'unforeseen anomalies' must surely be somewhere in her various dictionaries or even just a quick google for synonyms.
Economics will have given her an idea of swings and roundabouts; demand and supply, market forces, every action having a counter action, for example interest rates chasing exchange rates. The subpost offices being heavily cash rich owing to the fact that until recently, at least, pensioners and benefit collectors queued up for their money in cash. These days it goes straight to their bank, but nonetheless, at regular intervals, sub post offices needed to be delivered of large sums of cash in order to carry out business. All of which has to be accounted for. If there was a glitch in the Horizon system which meant every cash output to a customer had to have a corresponding receipt or voucher, then it becomes apparent that if the system is inadvertently duplicating some entries unbeknownst to the 'subbie' then it is not going to balance at the end of the day. Being told that this did happen and that Fujtisu staff could remotely access the system to presumably adjust it but without any audit trail, then clearly controls were not as they should be. Staff were digging into their own savings to make up the supposed differences thrown out by the system. So if there was a duplicate entry then they had to dream up a counter entry for the books to balance and then Catch-22 they would be done for 'false accounting' when the auditors arrive and fail to find the corresponding paperwork. How Vennells can claim there is no way she could figure out that this caused enormous stress to the 'subbies' in trying to balance their records - and convictions increased manifold from the pre-Horizon era - and that nobody told her, especially when Critchton the corporate lawyer gave her the Second Sight report into the failings of the system, it is just simply not plausible that she is Little Miss Innocent. And where was the audit trail whereby 'subbies' could follow what had happened? There was none so that should have been a red flag for a start.
Rather than listen to the 'subbies' concerns, Vennells decided she was going to fight them tooth and nail instead and got her lackies to put our false claims that the system was robust and then fighting them in the courts. That is not how a nice person behaves. Yet that is how she wants to be perceived. The dog collar is probably part of her disguise.