"Devon vomiting is extremely bad news as vomit has a high acidity level - so it's damaging to the join in Devon's oesophagus."
Devon was also due to be taken to theatre at 4pm yesterday for a laryngoscopy and a bronchoscopy, she said.
"Depending on what these scopes show he may also be having further granulation tissue removal (scraping the tissue off the inside of his trachea) and potential dilation in his trachea."
Ms Hacche said the messages of support posted on the Givealittle page set up to raise money for the family were helping to keep her going.
"I want to sincerely thank each and every one of you for the depth of support offered, gentle kindness and incredible generosity you have shown our wee family," she wrote on the fundraising page.
"The intensity of our situation is very overwhelming at times so I will sit with Devon and I will read back over your comments to find a bit more inner strength to keep going. Then Devon will smile at me and for a very flitting moment all feels right with the world again. (Please know I do read every single comment that is left for us - they are very significant to me).
"I am awed and often brought to tears by the beautiful comments that are left for us."
As of yesterday, almost $22,000 had been raised for Devon and his family.
Click here to donate.