Did the Son really get the Op?

Such a sad film but in a twisted way it's kind of upbeat from her point of view as her sole purpose throughout is trying to get her son operated on. Through out the trial and while on death row there are moments where it seems it's on a knife edge and your worrying that someone is going to find out and take the money back, and then the friend does just that to give to the lawyer and you think this is going to end cruelly.

But when the friend hands her the glasses and tells her he had the Operation Bjork and us are relieved that she is not dying for nothing, and that her pure mothers love sacrificed was achieved.

However and i really hope i am wrong but iv'e seen enough of these types of films when the director fucks with the audience and in kind of fitting with the whole retreating into a happy fantasy lie in order the cope with the brutal reality that the friend was only lying to her and order to give her one last peace of mind.

I have googled it and there doesn't seem to be anything about it but just an idea that if i am right possibly makes this the saddest film ever made