Hopefully she IS transforming children’s lives - isn’t that what most people who work in education hope for? I see nothing wrong with her being proud of what she does, but do understand your frustration at her giving herself an incorrect job title. Those who don’t work in education often have an outdated perception of a TAs role. Some TAs in my school are qualified teachers and many are graduates, with other professional qualifications. They play a significant role in changing children’s lives.
I once had a non-teacher colleague who referred to themselves as a ‘teacher’ to the children they taught. Not entirely sure why, but I think they believed it would command greater respect. I found it equally bizarre, but I know they had a desire to convert their degree and coaching qualifications to QTS? and be paid more for the job they were doing. I never challenged them in front of the children, as it was unnecessary, and they acknowledged they weren’t a qualified teacher in private discussions about their future career path.
It is sometimes confusing, because many TAs now also ‘teach.’ As a teacher, you will know this, so perhaps your desire to gate keep who can claim to be impactful could come across a little superior, although I’m sure that is not your intention.
Maybe she is embarrassed of her degree classification and it just makes her feel a little better? Who asks though?! I’d let that one slide, unless she is falsely stating her qualifications on applications etc.
I get why you are annoyed that she has awarded herself the same job title as you, when her job is very different and the workload is just not comparable. I’d give her a wide birth as she is clearly not your kind of person. I’m guessing her issue is self confidence and you calling her out is not likely to improve this.