Rising above it versus being walked all over

[TeenMinusTests]

Late teen DD has had years of 'low level' negative comments / behaviour from peers. Any one event trivial (so hard to report to teachers) but it has taken its toll in her self confidence. She's not quick of brain enough for smart retorts.
She doesn't want to rise above it anymore as she feels she's just getting walked all over. But also doesn't want to explode as she'll be the one getting into trouble.
I'm at a loss.
Any suggestions?

Someone in a thread on something similar in a work situation said ‘shine a light on it’. Basically, show you’ve noticed and don’t appreciate it. I suppose if she said something like ‘what do you mean by that?’ they would either back down or possibly overstep a mark and say something reportable.
I can see why rise above it won’t work if she is really ground down. People see you’re upset but not retaliating.
Good luck

Just on a practical level, could she move schools - if not now then soon. A fresh start can be helpful.

Is there a school counsellor she can have some practical sessions with? There should been some books on dealing with peers and difficult people you could get her, and between you you could talk them through, and try one strategy a time.

Maybe make a point of going out for coffee once a week to discuss progress? That might help her feel supported, and she should build some useful tools for life

She's in her first term at college on a specialised practical course that's only available there.
I like the 'shine a light on it' that might work for some bits.