I think you need to learn to value the things in life that AREN'T about material matters. Long term you will be happier whether or not this relationship survives (which I have my doubts about and I'm not necessarily meaning you breaking up with her. If you continue to not support her properly you could well find yourself being the one dumped!)
You're much younger than me I'm old enough to be your mother. At your age there can be with some a great focus on earning, getting on housing ladder etc BUT most people as they mature realise that those things are not what matters in life or relationships.
Most relationships are unequal in terms of earnings, sometimes the higher earner is always the same person, sometimes it's swings and roundabouts. When I was married sometimes ex was the higher earner, sometimes I was and sometimes we were closer to equal earnings we shared finances and neither begrudged supporting the other ever.
Within a relationship earnings really should not be the main focus. You will each bring strengths and weaknesses to it and in a good relationship you complement each other, filling each other's "gaps" in.
I caution you against any level of smugness too. You should know this working in medicine but nobody knows what is around the corner. Eg I have worked full time since I was 16 excepting when I went to uni as a mature student, until I was in a serious car accident some years ago which left me disabled. The effect on employment wasn't immediate as it was a complex set of circumstances both medically and personally but I now have been unable to work for almost a decade.
There are an awful lot of people being made redundant as a direct result of covid, medicine is in effect mostly a "safe" profession job loss wise. So you may be in a sort of "ivory tower" as aside from her you're perhaps not frequently in contact with people outside medicine ?
1.5mn people have already been made redundant due to covid (and some experts think that figure may be lower than the reality as it only includes "official" redundancies, so eg people on temp or zero hours contracts may not be included) by mid summer 2021 with the additional effects of Brexit some experts are warning redundancies may reach as many as 5mn over the course of that year from summer this year to 2021.
There aren't new jobs being created, whole companies are in exodus to EU, Asia etc because of Brexit, education and training was already suffering badly from cuts...
It's a mess!
Frankly she's done bloody well to
A get another job
B keep going with her studies
C not give in to a probably strong instinct to crawl in a corner and sob!
Give her the credit she is due, and your support (genuine not lip service)
If you can't do this then to be honest I think she's better off without you.
TLDR give your head a wobble she's doing bloody well considering the circumstances! Have her back!