Let me just preface this by saying that this is her decision and I will not be saying anything about it at all to her. I am just curious as to whether you think this is right, as it struck me as a tad unkind.
BTW I am 100% certain Dsis does not use MN.
Dsis has three children. Two are away at university and the youngest is in Year 13.
Dsis has just told me that after Christmas DN (the youngest) will not be continuing her music lessons. She has not told DN this.
DN is not very good at music. She started quite late (already in secondary school when she had her first lessons). She also does not practice every day. Maybe 3x per week. But she tries and she enjoys it and she recently sat her first ever theory exam and she worked really hard for it, ending up with a distinction (I think she sat grade 3 or 4). I know she and her teacher have plans for her to sit a practical exam next year.
Dsis was telling me that really the money could be better spent and that DN will need to concentrate on her academic work for year 13.
DN is doing exceptionally well academically (she may not be good at music or sport but she is great at school) and I know for a fact Dsis is not poor. ( I think the money will go on luxury items for -my sister)
So AIBU to think that this is quite unkind of Dsis? She will only have to pay for two more terms of music anyway and I think Christmas is a shit time of year to do this.
I know this is really trivial but it annoys me. DN has just asked me to go to her Christmas recital. 
AIBU?