The poor thing. What an ordeal for a first time (and young) mum.
If she wants to breastfeed I think she should but she will need support and it sounds like there was very little at the hossy. IMO she will find her BF journey very short lived if she has not been shown how to do it properly and doesn't have enough/proper support.
I think the hossy is wrong to tell her that it will be useless to even try.
Personally I found BF very difficult at the start and felt awful because of stitches and eventually a fissure, but I persisted because I wanted to give him the best start.
It could do her the world of good to BF and feel like she is doing something right (so to speak, there may be a feeling of it went wrong/trauma associated with the birth).
Hope this makes sense