It was Ava's father Stephen who saved the day by donating an astonishing 14 million stem cells to his one-year-old daughter for the pioneering transplant at St Jude's Research Centre in Tuebingen.
Speaking to the 'Journal' last night Stephen's sister Sharon Nixon said the family were delighted with how the transplant had gone.
"It couldn't have gone better, it really went brilliantly," said Sharon, who was yesterday sending milk off to Germany for her recovering niece.
"She's turned her nose up at the German milk so I'm sending her food from here," laughed Sharon. "We're just absolutely thrilled that she has the operation over her."
Sharon explained how doting father Stephen had gone above and beyond to save his little girl.
She said: "Basically Stephen had to produce 8.5 million cells to give Ava the amount she needed. Usually this is done over a period of two days but after one day Stephen had produced 14 million. Ava got the cells she needed and some more. The extra were frozen to be used in case of an emergency."
Although father and daughter are now recovering it was a tough process, as Sharon explained.
"Ava had some fluid around her lungs afterwards and took her a while to come round. Stephen said he felt very weird the day after he donated the cells but he seemed to come around okay after that and was right back to normal," she said.
It's been a long battle for the Nixon family since doctors sent Ava home in April telling her parents that nothing more could be done for her.
Ava's parents then battled to get the £100,000 funding necessary for the transplant and eventually secured the funding from the NHS.
Now, in just one week the family will find out if the transplant has been successful.
"It takes a week for the stem cells to absorb and after that a full blood count will be taken and a lumber puncture will determine how successful the whole thing has been," said Sharon.
Ava faces a lengthy stay in Germany with her parents Stephen and Fiona who are financing themselves during the stay.
Members of the public who wish to donate can do so through a fund set up in Ava's name at the Alliance and Leicester building society at the Diamond or by donating to the family home at 26 Marianus Park, Hazelbank.