I am very doubtful her peers all talk to their parents every day
This seems to be very normal now among university students I know, I think it's due, at least in part, to the ubiquity of the cell phone. When I was a student in residence only a few of us even had landlines in our rooms, most of us shared a payphone down the hall. Our parents either called that and tried their luck, or called the desk and left a message in our mailbox.
And of course we were used to being out of touch with parents all day at school, anytime we were out of the house after about age 12 (and actually even before that), on school or other trips, camping, etc, and were comfortable and secure with that. This was quite different from young people today who are often profoundly uncomfortable with being out of touch and feel the need for cell connectivity on wilderness camping trips.
My overall point being, even at 22 many young people are at a stage of separation that is still very dependent, so naturally they keep asking for help.
OP, my advice would be to start pulling back in certain areas. It's difficult to say where to start without a sense of your financial support, and of course things are abnormal at the moment, but one thing might be to take a kind of distant interest when she tells you things like "this course it too hard, the hours are too long in this job. You might say "oh, if you quit how will you pay or x? Do you have another job lined up?" But overall just don't get involved in the decision making past very practical things (Reminding her she needs to do some practical thing she doesn't know about, ok, helping her make a decision and sorting out dealing with the consequences, it's up to her don't get involved.)
Also, don't buy more interview outfits. She already has at least two.