Computer – For YouTube [ $$$ for my family :(( ]

My grandmother is sick, and I am a 14 year old that usually makes money off of YouTube since I don't work. I don't really upload quality videos though, due to the fact that I don't have a good computer :( So I can't be making much money for my grandmother. I'm trying to continue YouTube apart from the job that I'll be having when I grow up and I'd REALLY like to surprise her with ALL the YouTube money that I've earned, just to show my support and LOVE <3 to all that she has done to me and all the patience that she has had with me. [ Note: the picture is not my real grandmother, I don't really like to show pics of my family nor of myself on the internet, sorry and I hope you understand <3 :) ]