DD is the first in the family to go to uni and I am immensely proud of her and yes I often tell her that . She is doing really well academically and is likely to get a first but I am worried that she is living in a strange bubble of unreality
Your posts led me to believe you had not had experience of uni, and its irritating you, that she is seemingly not doing anything
But she is, and if she is on track to get a first, that's all she should be concentrating on, its that first that will help her get future jobs. Not a teeny bit of language work. Not all students work! At Oxbridge its discouraged.
You may think she is in a bubble of un reality, but she is just doing what thousands of other students are doing.
If I were you, I would be more worried about her social life, how she is getting on, its supposed to be the best time of her life.
Being a student is usually when DC break free for first time of parents control, be totally silly and wild. At the very least, joining some clubs, and making new friends.
I wonder if she is lonely and depressed and is also getting negative pressure from you.
I think you should try and make her happy at the moment, work out what going on with her and stop pressuring her.
She has several more years to sort out language work in other holidays, its not a burning immediate requirement for this one.
IF she is miserable/depressed, then she may stop working on her degree which would be the ultimate worse thing here, far more than a summer job. Support her to do well in her degree, and find out why she doesn't seem happy.
Its a reality she could end up with a flunked degree, depressed, in your house at the end of it all, with pitiful earning power and I know YOU dont want that