One of the most important things you can do is give yourself credit for how you manage trying to raise your consciousness as a mum. Being a mum myself, if there's one thing I try to remain conscious of it's this - When our child/children face 1st time challenges, we are also facing 1st time challenges. We're in it together with our kids in various ways. It's like when your eldest child turns 5, it's the 1st time you've been a mum to a 5 year old. When they turn 14, it's the 1st time you've been a mum to a 14 year old. It's always going to be a learning experience, navigating our children's firsts (job, broken heart etc). As I say to my 15yo son and 18yo daughter 'We gotta guide each other through this because we're winging it, to a degree'.
If you're daughter's pretty sensitive in certain ways, perhaps McDonald's is a pretty overwhelming 1st job for her. I swear, there are times where I'll walk into my local McDonald's at peak hour, as a customer, and the vibe of that place will trigger me. Everyone's running around behind the counter in some extreme state of hyperactivity and they're generally not looking too happy about it. I often feel sorry for them. If you're daughter's sensitive to noise or certain sounds to some degree, I can feel for her. I think I'd just about go insane if I had to work at McDonald's, in a shopping centre food court or a pokies venue. If she's sensitive to incompetent or rude managers and there's one where she was working, I can't say I blame her for leaving. We shouldn't have to tolerate that stuff. Perhaps she's better suited to a calmer environment which is far more supportive regarding new staff. Personally, I can't work with the public, they trigger me. I've spent a majority of my life working in disability and aged care.
If your daughter's a sensitive caring person, what jobs involve sensitivity and care? A job where she can express who she naturally is may be the way to go. While a lot of people may criticise your daughter for leaving that job or even criticise you, try leading them to guide her instead. Perhaps 'If McDonald's is just not you, what kind of job do you feel is you? What kind of environment would you thrive in? What kind of people would inspire you?' Encourage people to lead her to wonder, not self chastisement. Wonder exercises our open minded nature, stretching our imagination.
Perhaps you could go out together into different shops and see which shops she feels she'd love to work in.