Her husband Jason told Wales Online she had been 'let down by the NHS'.
He said: "Nobody took her seriously because she looked so well. She begged the doctors to give her tests.
"It's really shocking that this was allowed to happen. I will camp and protest on the steps of the Assembly until the money is given to send her to Germany. The NHS owes it to her."
Friends say they fear chemotherapy may cause the tumour to "explode", leaving immunotherapy as the only 'life-extending' treatment option.
Close family friend Laura Obradovic-Eaves added the NHS was 'refusing' to help Mrs Locke by not approving immunotherapy in the UK.
She said: "The family have argued their case to the NHS and asked them to skip the formalities of approval and give her the treatment here but so far they are refusing to help Tina."
So far they have raised £9,000 via a JustGiving page as well as charity events including a car boot sale and sponsored walks.