Supervisa why is that please ?

Hello

Hope that you’re all good

I was in the process of getting a great visa for my aunt. she wants to go visit her daughter and grandchildren. she received a visa refusal with the explanation that she did not prove that her daughter respected the minimum living income. I don't understand because her daughter is a doctor and we have sent her last 8 pay slips proving that she earns a good living. what could be missing? is this normal? is that not enough? Can we make appeal or is it better to make a new one ?

all the rest of the documents are good

thank you in advance for your help and advice