If she is worried, can she go back to the doc's (or ring the out of hours service?). Poor thing; I've had it and it's rubbish. What helped me was having a warm bath and expressing a little, but if she's not BF that's not helpful.
No lump. But she's in a lot of discomfort and the GP insiting she take the Anti-Biotiics before they do anything is is worrying her. If they haven't made a difference in a week, she's to go back for 'tests' but GP was not forthcoming on what they are likely to be.
A relative of mine has had an ongoing problem with this - had loads of antibiotics and finally an operation to remove the blocked ducts. It's been a right pain, but not life-threatening. I think it's a condition that mainly affects smokers, which she isn't.