My DD really struggles with emotional regulation, anxiety, and upheaval is her kryptonite. (Poor Kid. Sometimes feel that's all she's ever known, one way or another!)
Her anxiety was off the charts prior to going to uni'. Panic attacks - Every. Fucking. Day. She was on beta blockers, is now on sertraline.
Honestly, moving on to uni', getting on with her life, facing and doing the next big step, was the making of her. At one point we were all (including her) thinking that a gap year was inevitable.
She went there, was on the phone every day, sobbing. For the first two weeks. After that, she found her feet, her tribe, her vibe, and loved her course.
I think if we'd done anything to force a gap year, she would have actually spiralled far worse, as it would have fed her fears, her sense of failure and inadequacy, and her belief that happy independence was not something she could attain.
She knew we were always here to support her, any hour of the night or day, but she really needed to give it the old college try, and give it her all to make it work for a good solid chunk - at least a month, preferably a term.
Getting over a broken heart - what better way than fields afresh? She'll have friends there, plenty to do, new fellas to meet.
I'd be doing more to drum in personal responsibility for her safety, both physical and emotional, and making sure they know the girl code to have each others' backs on a night out. Also, contraception. Try to build her up, strong and bloody minded, to seize the fish, and flourish.