What can I do with my daughter's rose(s)?

in Plants
It is a well established fact that I am rubbish with flowers (but trying to be better) and roses in particular - not a scooby. My daughter's very good friend gave her one of these SM miniature things and she wants to save it if possible.
So far it has been overwhelmed by aphids - got rid of those with WUL and a bit of hands on squidging. Really bad black spot - I pruned it within an inch of its life last week during a mild spell and I reckon there are four plants in this pot!
Help. Now what do I do? The pot is clearly too small for that many plants or do miniature roses manage with less? Can I repot them all now? I'll try and take a picture tomorrow when its light but prompted to ask now as she phoned to see if it(they?) is doing OK. Oh the responsibility.
So far it has been overwhelmed by aphids - got rid of those with WUL and a bit of hands on squidging. Really bad black spot - I pruned it within an inch of its life last week during a mild spell and I reckon there are four plants in this pot!
Help. Now what do I do? The pot is clearly too small for that many plants or do miniature roses manage with less? Can I repot them all now? I'll try and take a picture tomorrow when its light but prompted to ask now as she phoned to see if it(they?) is doing OK. Oh the responsibility.
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
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My daughter on the other hand seems to have formed an emotional attachment (possibly because of the person who gave it/them to her) and harbours an ambition to keep it going.
Given the obvious transient nature of these plants I feel more confident about re-potting them, nothing ventured nothing gained eh?
Do roses need special compost or feed? I really haven't a clue.....
Got another job for tomorrow I guess.