Put it like this, your mum could be entering the final stages of her life, there will come a day when youd want to see her, hear her voice again, the comfort from the mothers bosom that comforted you as a child and shes not here because she has passed, go home and enjoy the time you have left with her show her the love and admiration you have for her because when shes not here youll miss her terribly. You can go back to spain after and pick up again, personally thats what id do, without hesitation