sorry she got the dog put to sleep the day after by the same vets but different practice, she wouldnt have had the full amount to be able to proceed with the treatment and things the night before however she did offer to pay half of what it would cost but they said no because she had no money on her,I can't quite make head or tail of this story, so much of it does not make sense at all. Not your fault

but I just feel that your friend is relaying the bits which hit home with her perhaps missing out bits of the conversation and only remembering her side as often happens when we are upset and feeling helpless.
Vets generally are not in a practice on an evening they have homes and lives too, it is usually just a cover nurse or two who may be there to care for any overnight patients with a vet on call in an emergency who can be called in. I don't understand that rather than pick up the phone on an evening and ring around vets in the area asking for help, she chose to take a sick dog in a car and go door knocking at veterinaries, does that really make sense to you? It doesn't to me, not one bit.
Then,
they asked her how much money she had? she didnt have anything on her and didnt get paid till the next day, they replied "we're not a charity" did she even speak to a vet here, was this just the nurse or a receptionist? Your seriously expecting anyone to believe they would not wait a day to be paid? Or in an emergency offer a payment plan? Are you sure she has relayed this correctly? I just feel there are whole bits missing here, it doesn't make sense. If these
are the complete facts then get in touch with the RCVS and have your friend relay everything truthfully to them.
http://www.rcvs.org.uk/Templates/Internal.asp?NodeID=89916&int1stParentNodeID=89644What else does not make sense is that she then took this sick dog home, waited until the next day and took it back to the same practice at another branch and they put the dog to sleep. Why would they put the dog to sleep if they did not feel there was much hope? Does it make sense that they would do that, to me it doesn't.
It seems that the dog must have been in serious trouble but maybe your friend could not pay for the exploration work which often is just circumstance, and often still can not save a life, with insurance they may well do it, if a vet truly felt a dog could be saved then surely they would not put it to sleep, or is my faith in vets truly misdirected and they have become an uncaring business wherein if you don't have the money, hard luck! Gosh I hope that isn't true. I pray that isn't true.

I feel desperately sorry for your friend, did she call the RSPCA, PDSA I would try everyone if I felt my dog could be saved, being embarrassed or having someone speak down to you, as she indicates would not stop me from trying everything.
By all means tell your friend to stand up for herself, not to be afraid to take things further and complain to the above link. But, I truly hope that she has just left huge holes in this story as it does not bare thinking about, just everyone make sure that you are registered with a vet and have insurance or a credit card always when you have a animal to care for.
Let us know what happens.